Fix LTO on Linux by not specifying a blacklist.

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 6255 matching lines @@
         ],
       },
     }],
     # TODO(pcc): Make these flags work correctly with CFI.
     ['use_lto!=0 and cfi_vptr==0', {
       'target_defaults': {
         'target_conditions': [
           ['_toolset=="target"', {
             'cflags': [
               '-fwhole-program-vtables',
-              # TODO(pcc): Remove this flag once the upstream interface change
-              # (http://reviews.llvm.org/D18635) lands.
-              '-fwhole-program-vtables-blacklist=<(cfi_blacklist)',
             ],
             'ldflags': [
               '-fwhole-program-vtables',
             ],
           }],
         ],
       },
     }],
   ],
   'xcode_settings': {
@@ skipping 44 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',
   },
 }