content: Rename webkit_test_helpers.{cc,h} to blink_test_helpers.{cc,h}

content/shell/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("//tools/grit/repack.gni")
 import("//tools/grit/grit_rule.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 126 matching lines @@
     "common/shell_content_client.cc",
     "common/shell_content_client.h",
     "common/shell_messages.cc",
     "common/shell_messages.h",
     "common/shell_switches.cc",
     "common/shell_switches.h",
     "common/shell_test_configuration.cc",
     "common/shell_test_configuration.h",
     "common/test_runner/test_preferences.cc",
     "common/test_runner/test_preferences.h",
-    "common/webkit_test_helpers.cc",
-    "common/webkit_test_helpers.h",
     "renderer/ipc_echo.cc",
     "renderer/ipc_echo.h",
+    "renderer/layout_test/blink_test_helpers.cc",
+    "renderer/layout_test/blink_test_helpers.h",
     "renderer/layout_test/blink_test_runner.cc",
     "renderer/layout_test/blink_test_runner.h",
     "renderer/layout_test/gc_controller.cc",
     "renderer/layout_test/gc_controller.h",
     "renderer/layout_test/layout_test_content_renderer_client.cc",
     "renderer/layout_test/layout_test_content_renderer_client.h",
     "renderer/layout_test/layout_test_render_frame_observer.cc",
     "renderer/layout_test/layout_test_render_frame_observer.h",
     "renderer/layout_test/layout_test_render_process_observer.cc",
     "renderer/layout_test/layout_test_render_process_observer.h",
@@ skipping 373 matching lines @@
     }
   }
 } else {
   group("content_shell") {
     testonly = true
     deps = [
       ":content_shell_lib",
     ]
   }
 }