Refactor Blink's ServiceConnector and add ability to mock in layout tests

third_party/WebKit/Source/platform/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/features.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
@@ skipping 262 matching lines @@
     "Prerender.cpp",
     "Prerender.h",
     "PrerenderClient.h",
     "ScopedOrientationChangeIndicator.cpp",
     "ScopedOrientationChangeIndicator.h",
     "ScriptForbiddenScope.cpp",
     "ScriptForbiddenScope.h",
     "SecureTextInput.cpp",
     "SecureTextInput.h",
     "SerializedResource.h",
-    "ServiceConnector.h",
     "SharedBuffer.cpp",
     "SharedBuffer.h",
     "SharedBufferChunkReader.cpp",
     "SharedBufferChunkReader.h",
     "StorageQuotaCallbacks.h",
     "Supplementable.cpp",
     "Supplementable.h",
     "Theme.cpp",
     "Theme.h",
     "ThemeTypes.h",
@@ skipping 1768 matching lines @@
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }