Enable -Wsentinel on linux32, take 2.

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 2454 matching lines @@
         'cflags_cc+': [
           '-frtti',
           '-gline-tables-only',
           '-fintercept-allocation-functions',
         ],
         'defines': ['TYPE_PROFILING'],
         'dependencies': [
           '<(DEPTH)/base/allocator/allocator.gyp:type_profiler',
         ],
       }],
-      ['OS=="linux" and clang==1 and host_arch=="ia32"', {
-        # TODO(dmikurube): Remove -Wno-sentinel when Clang/LLVM is fixed.
-        # See http://crbug.com/162818.
-        'cflags+': ['-Wno-sentinel'],
-      }],
       ['branding=="Chrome"', {
         'defines': ['GOOGLE_CHROME_BUILD'],
       }, {  # else: branding!="Chrome"
         'defines': ['CHROMIUM_BUILD'],
       }],
       ['OS=="mac" and component=="shared_library"', {
         'xcode_settings': {
           'DYLIB_INSTALL_NAME_BASE': '@rpath',
           'LD_RUNPATH_SEARCH_PATHS': [
             # For unbundled binaries.
@@ skipping 3160 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',
   },
 }