Roll chromium_revision 68cf0b8..aa8e58a (361406:361601)

Due to Chromium moving over to building with a sysroot
image on Linux in
a931efd5dc
we need to disable that until http://crbug.com/561584 is fixed
(libudev.h is missing and is used by talk/media/devices/libudevsymboltable.h).

Change log: 68cf0b8..aa8e58a
Full diff: 68cf0b8..aa8e58a

No dependencies changed.
No update to Clang.

BUG=chromium:561584
CQ_EXTRA_TRYBOTS=tryserver.webrtc:win_baremetal,mac_baremetal,linux_baremetal
NOTRY=True
NOPRESUBMIT=True

Review URL: https://codereview.webrtc.org/1468313006

Cr-Commit-Position: refs/heads/master@{#10795}

DEPS

@@ -6,7 +6,7 @@
 vars = {
   'extra_gyp_flag': '-Dextra_gyp_flag=0',
   'chromium_git': 'https://chromium.googlesource.com',
-  'chromium_revision': '68cf0b8360a8ea1dbcd5efb524e7831e1c22bd66',
+  'chromium_revision': 'aa8e58a3274d31c25d15f909a2a9190149856b9b',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than

webrtc/supplement.gypi

@@ -5,9 +5,14 @@
       # Override the default (10.6) in Chromium's build/common.gypi.
       # Needed for ARC and libc++.
       'mac_deployment_target%': '10.7',
+      # Disable use of sysroot for Linux. It's enabled by default in Chromium,
+      # but it currently lacks the libudev-dev package.
+      # TODO(kjellander): Remove when crbug.com/561584 is fixed.
+      'use_sysroot': 0,
     },
     'webrtc_root%': '<(webrtc_root)',
     'mac_deployment_target%': '<(mac_deployment_target)',
+    'use_sysroot%': '<(use_sysroot)',
     'build_with_chromium': 0,
     'conditions': [
       ['OS=="ios"', {