Cleanup warnings configs and enable more for Android ARM64

webrtc/build/common.gypi

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # This file contains common settings for building WebRTC components.
 
@@ skipping 302 matching lines @@
          'includes': [
            # Rules for excluding e.g. foo_win.cc from the build on non-Windows.
            'filename_rules.gypi',
          ],
          # Include the top-level dir so the WebRTC code can use full paths.
         'include_dirs': [
           '../..',
         ],
         'conditions': [
           ['os_posix==1', {
-            'conditions': [
-              # -Wextra is currently disabled in Chromium's common.gypi. Enable
-              # for targets that can handle it. For Android/arm64 right now
-              # there will be an 'enumeral and non-enumeral type in conditional
-              # expression' warning in android_tools/ndk_experimental's version
-              # of stlport.
-              # See: https://code.google.com/p/chromium/issues/detail?id=379699
-              ['target_arch!="arm64" or OS!="android"', {
-                'cflags': [
-                  '-Wextra',
-                  # We need to repeat some flags from Chromium's common.gypi
-                  # here that get overridden by -Wextra.
-                  '-Wno-unused-parameter',
-                  '-Wno-missing-field-initializers',
-                  '-Wno-strict-overflow',
-                ],
-              }],
+            # Enable more warnings: -Wextra is currently disabled in Chromium.
+            'cflags': [
+              '-Wextra',
+              # Repeat some flags that get overridden by -Wextra.
+              '-Wno-unused-parameter',
+              '-Wno-missing-field-initializers',
+              '-Wno-strict-overflow',
             ],
             'cflags_cc': [
               '-Wnon-virtual-dtor',
               # This is enabled for clang; enable for gcc as well.
               '-Woverloaded-virtual',
             ],
           }],
           ['clang==1', {
             'cflags': [
               '-Wimplicit-fallthrough',
@@ skipping 245 matching lines @@
         }],
         ['OS=="freebsd"', {
           'defines': [
             'FREEBSD',
           ],
         }],
       ],
     },
   }, # target_defaults
 }