Revert of Use --icf=all instead of --icf=safe

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 647 matching lines @@
       # third_party/llvm-build/Release+Asserts/lib must be added to
       # $DYLD_LIBRARY_PATH to pick up the right version of the linker plugin.
       #
       # On Android, the variables must *not* be enabled at the same time.
       # In this case LTO would 'merge' the optimization flags at link-time
       # which would lead to all code be optimized with -O2. See crbug.com/407544
       'use_lto%': 0,
       'use_lto_o2%': 0,
 
       # Allowed level of identical code folding in the gold linker.
-      'gold_icf_level%': 'all',
+      'gold_icf_level%': 'safe',
 
       # Libxkbcommon usage.
       'use_xkbcommon%': 0,
 
       # Control Flow Integrity for virtual calls.
       # See http://clang.llvm.org/docs/ControlFlowIntegrity.html
       'cfi_vptr%': 0,
 
       # Control Flow Integrity for casts.
       # See http://clang.llvm.org/docs/ControlFlowIntegrity.html
@@ skipping 5564 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',
   },
 }