Fixing Coverity bugs (DEAD_CODE and PASS_BY_VALUE)

CIDs 16230, 16439, 16610, 16635

BUG=NONE
TEST=NONE

Review URL: http://codereview.chromium.org/7215029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@90134 0039d316-1c4b-4281-b951-d872f2087c98
GpuFeatureFlags GpuDataManager::GetGpuFeatureFlags() {
  return gpu_feature_flags_;
}

GpuFeatureFlags GpuDataManager::GetGpuFeatureFlags() {
  return gpu_feature_flags_;
}
