Revert of Use /LTCG:Incremental to speed up the non-clobber official 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 5506 matching lines @@
             # - "size", optimizes for minimal code size - the default.
             # - "speed", optimizes for speed over code size.
             # - "max", whole program optimization and link-time code
             #   generation. This is very expensive and should be used
             #   sparingly.
             'variables': {
               'optimize%': 'size',
             },
             'msvs_settings': {
               'VCLinkerTool': {
+                # Set /LTCG for the official builds.
+                'LinkTimeCodeGeneration': '1',
                 'AdditionalOptions': [
-                  # Enable /LTCG for the official builds. Use the incremental
-                  # mode to speed-up the non-clobber builds. This is not the
-                  # same as incremental linking (/INCREMENTAL) and doesn't have
-                  # any impact on code size or on performance.
-                  '/LTCG:INCREMENTAL',
                   # Set the number of LTCG code-gen threads to eight.
                   # The default is four. This gives a 5-10% link speedup.
                   '/cgthreads:8',
                 ],
               },
             },
             'target_conditions': [
               ['optimize=="size"', {
                 'msvs_settings': {
                   'VCCLCompilerTool': {
@@ skipping 829 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',
   },
 }