Revert of Revert of views: Move TOOLKIT_VIEWS definition in //ui/views/ from root.

chrome/browser/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 283 matching lines @@
       "//third_party/re2",
       "//third_party/smhasher:cityhash",
       "//third_party/webrtc/modules/desktop_capture",
       "//ui/base/ime",
       "//ui/gl",
       "//ui/resources",
       "//ui/surface",
       "//ui/web_dialogs",
       "//v8",
     ]
+
+    if (toolkit_views) {
+      deps += [ "//ui/views" ]
+    }
   } else {  # iOS
     sources +=
         rebase_path(gypi_values.chrome_browser_ios_sources, ".", "//chrome")
     sources +=
         rebase_path(gypi_values.chrome_browser_google_sources, ".", "//chrome")
     deps += [ "//net" ]
     libs += [
       "CoreTelephony.framework",
       "CoreText.framework",
       "MobileCoreServices.framework",
@@ skipping 862 matching lines @@
     ]
   }
 
   if (enable_wifi_bootstrapping) {
     sources += [
       "local_discovery/wifi/mock_wifi_manager.cc",
       "local_discovery/wifi/mock_wifi_manager.h",
     ]
   }
 }