Move resource_loader_bridge.* from webkit/child to content/child.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 109 matching lines @@
     "//ui/snapshot",
     "//ui/strings",
     "//ui/surface",
     "//ui/views",
     "//ui/views/controls/webview",
     "//ui/web_dialogs",
     "//ui/wm",
     "//url",
     "//v8:v8",
     "//webkit/browser:storage",
-    "//webkit/child",
   ]
 
   if (!is_win) {
     deps += [ "//breakpad:symupload" ]
   }
 
   if (is_linux) {
     deps += [
       "//dbus",
       "//third_party/fontconfig",
@@ skipping 81 matching lines @@
       "//google_apis/gcm",
       "//remoting/client/plugin",
       "//third_party/cld_2",
       "//third_party/libaddressinput",
       "//third_party/ffmpeg",
       "//ui:ui_unittests",
       "//ui/app_list",
       "//ui/web_dialogs",
       "//ui/wm",
       "//webkit/browser:storage",
-      "//webkit/child",
     ]
   }
 
   if (use_ozone) {
     deps += [
       "//ui/ozone",
       "//ui/ozone/demo",
     ]
   }
 
   # Non-mobile builds.
   if (!is_android && !is_ios) {
     deps += [
       "//device/usb",
     ]
   }
 }