[Android WebView] Fix downstream mac builds.

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 2755 matching lines @@
                   # Only link with needed input sections. This is to avoid
                   # getting undefined reference to __cxa_bad_typeid in the CDU
                   # library.
                   '-Wl,--gc-sections',
                   # Warn in case of text relocations.
                   '-Wl,--warn-shared-textrel',
                 ],
               }],
               ['OS=="android" and android_webview_build==1', {
                 'ldflags!': [
-                  # Must not turn on --fatal-warnings, see crbug.com/157326.
+                  # Must not turn on --fatal-warnings or warn-shared-textrel,
+                  # see crbug.com/157326.
                   '-Wl,--fatal-warnings',
+                  '-Wl,--warn-shared-textrel',
                 ],
               }],
               ['OS=="android" and android_full_debug==0', {
                 # Some configurations are copied from Release_Base to reduce
                 # the binary size.
                 'variables': {
                   'debug_optimize%': 's',
                 },
                 'cflags': [
                   '-fomit-frame-pointer',
@@ skipping 57 matching lines @@
                   '-fomit-frame-pointer',
                 ],
                 'ldflags': [
                   '-Wl,--fatal-warnings',
                   # Warn in case of text relocations.
                   '-Wl,--warn-shared-textrel',
                 ],
               }],
               ['OS=="android" and android_webview_build==1', {
                 'ldflags!': [
-                  # Must not turn on --fatal-warnings, see crbug.com/157326.
+                  # Must not turn on --fatal-warnings or
+                  # shared-text-rel, see crbug.com/157326.
                   '-Wl,--fatal-warnings',
+                  '-Wl,--warn-shared-textrel',
                 ],
               }],
               ['clang==1', {
                 'cflags!': [
                   '-fno-ident',
                 ],
               }],
               ['profiling==1', {
                 'cflags': [
                   '-fno-omit-frame-pointer',
@@ skipping 1767 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }