Move mac_views_browser grit define out of tools/grit.

tools/grit/grit_rule.gni

 # Copyright 2014 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.
 
 # Instantiate grit. This will produce a script target to run grit, and a
 # static library that compiles the .cc files.
 #
 # Parameters
 #
 #   source (required)
@@ skipping 74 matching lines @@
 #     grit_flags = [ "-E", "foo=bar" ]  # Optional extra flags.
 #     # You can also put deps here if the grit source depends on generated
 #     # files.
 #   }
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//third_party/closure_compiler/closure_args.gni")
-import("//ui/base/ui_features.gni")
 
 assert(!enable_resource_whitelist_generation || is_android,
        "resource whitelist generation only works on android")
 
 declare_args() {
   # When set, this will fork out to grit at GN-time to get all inputs
   # referenced by the .grd file.
   #
   # Normal builds don't need this since proper incremental builds are handled
   # by grit writing out the inputs in .d files at build-time. But for analyze
@@ skipping 146 matching lines @@
     "-D",
     "enable_task_manager",
   ]
 }
 if (enable_notifications) {
   grit_defines += [
     "-D",
     "enable_notifications",
   ]
 }
-if (mac_views_browser) {
-  grit_defines += [
-    "-D",
-    "mac_views_browser",
-  ]
-}
 
 # TODO(aberent): Enable for other platforms once the build machines have
 #                Java on them (and hence can run the closure compiler).
 _strip_resource_files = is_android
 _js_minifier = "//third_party/closure_compiler/js_minify.py"
 
 grit_resource_id_file = "//tools/gritsettings/resource_ids"
 grit_info_script = "//tools/grit/grit_info.py"
 
 template("grit") {
@@ skipping 219 matching lines @@
     if (defined(invoker.configs)) {
       configs += invoker.configs
     }
 
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
     output_name = grit_output_name
   }
 }