Don't disable -Wabsolute-value when building for arm.

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 3703 matching lines @@
                       # The codesourcery arm-2009q3 toolchain warns at that the ABI
                       # has changed whenever it encounters a varargs function. This
                       # silences those warnings, as they are not helpful and
                       # clutter legitimate warnings.
                       '-Wno-abi',
                     ],
                   }],
                   ['clang==1 and arm_arch!="" and OS!="android"', {
                     'cflags': [
                       '-target arm-linux-gnueabihf',
-                      # TODO(sbc): Remove this once the warning in libvpx is fixed:
-                      # https://code.google.com/p/webm/issues/detail?id=829
-                      '-Wno-absolute-value',
                     ],
                     'ldflags': [
                       '-target arm-linux-gnueabihf',
                     ],
                   }],
                   ['arm_arch!=""', {
                     'cflags': [
                       '-march=<(arm_arch)',
                     ],
                   }],
@@ skipping 1946 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',
   },
 }