diff --git a/tools_webrtc/autoroller/roll_deps.py b/tools_webrtc/autoroller/roll_deps.py
index 28db376382..e1e4a36124 100755
--- a/tools_webrtc/autoroller/roll_deps.py
+++ b/tools_webrtc/autoroller/roll_deps.py
@@ -32,6 +32,24 @@ DONT_AUTOROLL_THESE = [
   'src/third_party/ffmpeg',
 ]
 
+# These dependencies are missing in chromium/src/DEPS, either unused or already
+# in-tree. For instance, src/base is a part of the Chromium source git repo,
+# but we pull it through a subtree mirror, so therefore it isn't listed in
+# Chromium's deps but it is in ours.
+WEBRTC_ONLY_DEPS = [
+  'src/base',
+  'src/build',
+  'src/ios'
+  'src/testing',
+  'src/third_party',
+  'src/third_party/findbugs',
+  'src/third_party/gtest-parallel',
+  'src/third_party/winsdk_samples',
+  'src/third_party/yasm/binaries',
+  'src/tools',
+]
+
+
 # Run these CQ trybots in addition to the default ones in infra/config/cq.cfg.
 EXTRA_TRYBOTS = (
   'master.internal.tryserver.corp.webrtc:linux_internal'
@@ -321,11 +339,10 @@ def FindRemovedDeps(webrtc_deps, new_cr_deps):
   all_removed_deps = _FindNewDeps(new_cr_deps, webrtc_deps)
   generated_android_deps = [path for path in all_removed_deps
                             if path.startswith(ANDROID_DEPS_PATH)]
-  # DepsEntry are assumed to be webrtc-only dependencies,
-  # and are handled in CalculatedChangedDeds.
+  # Webrtc-only dependencies are handled in CalculateChangedDeps.
   other_deps = [path for path in all_removed_deps
                 if path not in generated_android_deps and
-                not isinstance(webrtc_deps['deps'][path], DepsEntry)]
+                   path not in WEBRTC_ONLY_DEPS]
   return generated_android_deps, other_deps
 
 
@@ -365,7 +382,7 @@ def CalculateChangedDeps(webrtc_deps, new_cr_deps):
           'WebRTC DEPS entry %s has a different URL (%s) than Chromium (%s).' %
           (path, webrtc_deps_entry.url, cr_deps_entry.url))
     else:
-      if isinstance(webrtc_deps_entry, DepsEntry):
+      if path in WEBRTC_ONLY_DEPS:
         # Use the HEAD of the deps repo.
         stdout, _ = _RunCommand(['git', 'ls-remote', webrtc_deps_entry.url,
                                 'HEAD'])
diff --git a/tools_webrtc/autoroller/unittests/roll_deps_test.py b/tools_webrtc/autoroller/unittests/roll_deps_test.py
index 200c9540fb..e9912f91ce 100755
--- a/tools_webrtc/autoroller/unittests/roll_deps_test.py
+++ b/tools_webrtc/autoroller/unittests/roll_deps_test.py
@@ -72,7 +72,7 @@ class FakeCmd(object):
 
 
 class NullCmd(object):
-  """ No-op mock when calls mustn't be checked. """
+  """No-op mock when calls mustn't be checked. """
 
   def __call__(self, *args, **kwargs):
     # Empty stdout and stderr.
@@ -218,7 +218,7 @@ class TestRollChromiumRevision(unittest.TestCase):
     self.assertEquals(changed_deps[2].new_version, 'version:1.10.0-cr0')
 
   def testWithDistinctDeps(self):
-    """ Check CalculateChangedDeps still works when deps are added/removed. """
+    """Check CalculateChangedDeps still works when deps are added/removed. """
     webrtc_deps = ParseLocalDepsFile(self._webrtc_depsfile_android)
     new_cr_deps = ParseLocalDepsFile(self._new_cr_depsfile_android)
     changed_deps = CalculateChangedDeps(webrtc_deps, new_cr_deps)
@@ -251,17 +251,25 @@ class TestRollChromiumRevision(unittest.TestCase):
     self.assertEquals(other_paths, [])
 
   def testMissingDepsIsDetected(self):
-    """ Check an error is reported when deps cannot be automatically removed."""
+    """Check an error is reported when deps cannot be automatically removed."""
     # The situation at test is the following:
     #   * A WebRTC DEPS entry is missing from Chromium.
     #   * The dependency isn't an android_deps (those are supported).
     webrtc_deps = ParseLocalDepsFile(self._webrtc_depsfile)
     new_cr_deps = ParseLocalDepsFile(self._new_cr_depsfile_android)
     _, other_paths = FindRemovedDeps(webrtc_deps, new_cr_deps)
-    self.assertEquals(other_paths, ['src/build',
-                                    'src/third_party/xstream',
+    self.assertEquals(other_paths, ['src/third_party/xstream',
                                     'src/buildtools'])
 
+  def testExpectedDepsIsNot(self):
+    """Some deps musn't be seen as missing, even if absent from Chromium."""
+    webrtc_deps = ParseLocalDepsFile(self._webrtc_depsfile)
+    new_cr_deps = ParseLocalDepsFile(self._new_cr_depsfile_android)
+    removed_android_paths, other_paths = FindRemovedDeps(webrtc_deps,
+                                                         new_cr_deps)
+    self.assertTrue('src/build' not in removed_android_paths)
+    self.assertTrue('src/build' not in other_paths)
+
   def _CommitMessageSetup(self):
     webrtc_deps = ParseLocalDepsFile(self._webrtc_depsfile_android)
     new_cr_deps = ParseLocalDepsFile(self._new_cr_depsfile_android)