Revert of Use /LTCG:Incremental to speed up the non-clobber official builds.

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 1189 matching lines @@
       # they're unrelated constants, which saves binary size.
       # This optimization can't be used when ASan is enabled because
       # it is not compatible with the ASan ODR checker.
       "/Gw",
     ]
   }
   common_optimize_on_ldflags = [ "/OPT:ICF" ]  # Redundant COMDAT folding.
   if (is_official_build) {
     common_optimize_on_ldflags += [
       "/OPT:REF",  # Remove unreferenced data.
-
-      # 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",
+      "/LTCG",  # Link-time code generation.
 
       # Set the number of LTCG code-gen threads to eight. The default is four.
       # This gives a 5-10% link speedup.
       "/cgthreads:8",
     ]
     if (full_wpo_on_official) {
       arflags = [ "/LTCG" ]
     }
   }
 } else {
@@ skipping 266 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }