Clean up the obsolete asan=1 config bits:

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 1181 matching lines @@
           '<!@(<(DEPTH)/tools/clang/scripts/plugin_flags.sh)'
         ],
       }],
 
       ['enable_web_intents_tag==1', {
         'grit_defines': ['-D', 'enable_web_intents_tag'],
       }],
 
       ['asan==1', {
         'clang%': 1,
-        # Do not use Chrome plugins for Clang. The Clang version in
-        # third_party/asan may be different from the default one.
-        # TODO(glider): this isn't true anymore, need to check if we can use the
-        # plugins now.
-        'clang_use_chrome_plugins%': 0,
       }],
       ['asan==1 and OS=="mac"', {
         # See http://crbug.com/145503.
         'component': "static_library",
       }],
       ['tsan==1', {
         'clang%': 1,
       }],
 
       # On valgrind bots, override the optimizer settings so we don't inline too
@@ skipping 1690 matching lines @@
           }],
         ],
         'target_conditions': [
           ['_type!="static_library"', {
             'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-search_paths_first']},
             'conditions': [
               ['asan==1', {
                 'xcode_settings': {
                   'OTHER_LDFLAGS': [
                     '-faddress-sanitizer',
-                    # The symbols below are referenced in the ASan runtime
-                    # library (compiled on OS X 10.6), but may be unavailable
-                    # on the prior OS X versions. Because Chromium is
-                    # currently targeting 10.5.0, we need to explicitly mark
-                    # these symbols as dynamic_lookup.
-                    '-Wl,-U,_malloc_default_purgeable_zone',
-                    '-Wl,-U,_malloc_zone_memalign',
-                    '-Wl,-U,_dispatch_sync_f',
-                    '-Wl,-U,_dispatch_async_f',
-                    '-Wl,-U,_dispatch_barrier_async_f',
-                    '-Wl,-U,_dispatch_group_async_f',
-                    '-Wl,-U,_dispatch_after_f',
                   ],
                 },
               }],
             ],
           }],
           ['_mac_bundle', {
             'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
           }],
           ['_type=="executable"', {
             'postbuilds': [
@@ skipping 480 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',
   },
 }