Extract WebFrameClient implementation out of WebTestProxyBase.

components/test_runner/BUILD.gn

 # Copyright 2015 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/features.gni")
 import("//build/config/ui.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
@@ skipping 59 matching lines @@
     "test_runner.h",
     "test_runner_export.h",
     "text_input_controller.cc",
     "text_input_controller.h",
     "tracked_dictionary.cc",
     "tracked_dictionary.h",
     "web_ax_object_proxy.cc",
     "web_ax_object_proxy.h",
     "web_content_settings.cc",
     "web_content_settings.h",
+    "web_frame_test_client.cc",
+    "web_frame_test_client.h",
     "web_frame_test_proxy.h",
     "web_task.cc",
     "web_task.h",
     "web_test_delegate.h",
     "web_test_interfaces.cc",
     "web_test_interfaces.h",
     "web_test_proxy.cc",
     "web_test_proxy.h",
     "web_test_runner.h",
   ]
@@ skipping 97 matching lines @@
 
     if (is_mac) {
       libs = [ "AppKit.framework" ]
     }
 
     deps = [
       "//build/config/sanitizers:deps",
     ]
   }
 }