Android WebView: fix linking host binaries on mac.

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 3367 matching lines @@
               '-Wl,-z,noexecstack',
               '-Wl,--gc-sections',
               '-Wl,-O1',
               '-Wl,--as-needed',
             ],
             'sources/': [
               ['exclude', '_android(_unittest)?\\.cc$'],
               ['exclude', '(^|/)android/']
             ],
           }],
+          # Settings for building host targets on mac.
+          ['_toolset=="host" and host_os=="mac"', {
+            'ldflags!': [
+              '-Wl,-z,now',
+              '-Wl,-z,relro',
+            ],
+          }],
         ],
       },
     }],
     ['OS=="solaris"', {
       'cflags!': ['-fvisibility=hidden'],
       'cflags_cc!': ['-fvisibility-inlines-hidden'],
     }],
     ['OS=="mac" or OS=="ios"', {
       'target_defaults': {
         'mac_bundle': 0,
@@ skipping 752 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',
   },
 }