GYP: Remove targets inside include_tests==1 that are converted to GN.

Remove a large number of targets that are no longer built, to reduce maintenance.
Only targets that have a GN version were removed.

BUG=webrtc:6323
NOTRY=True
NOPRESUBMIT=True

Review-Url: https://codereview.webrtc.org/2340773003
Cr-Commit-Position: refs/heads/master@{#14231}

webrtc/modules/audio_coding/codecs/g711/g711.gypi

@@ -26,20 +26,4 @@
       ],
     },
   ], # targets
-  'conditions': [
-    ['include_tests==1', {
-      'targets': [
-        {
-          'target_name': 'g711_test',
-          'type': 'executable',
-          'dependencies': [
-            'g711',
-          ],
-          'sources': [
-            'test/testG711.cc',
-          ],
-        },
-      ], # targets
-    }], # include_tests
-  ], # conditions
 }