Shunt string-dumping functions from WebFrame to a side class.

third_party/WebKit/public/blink_headers.gypi

 # 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.
 
 {
   'variables': {
     'blink_public_sources': [
       "platform/Platform.h",
       "platform/URLConversion.h",
       "platform/WebApiKeyValidator.h",
@@ skipping 381 matching lines @@
       "web/WebExternalPopupMenuClient.h",
       "web/WebFileChooserCompletion.h",
       "web/WebFileChooserParams.h",
       "web/WebFindOptions.h",
       "web/WebFont.h",
       "web/WebFontDescription.h",
       "web/WebFormControlElement.h",
       "web/WebFormElement.h",
       "web/WebFrame.h",
       "web/WebFrameClient.h",
+      "web/WebFrameContentDumper.h",
       "web/WebFrameLoadType.h",
       "web/WebFrameOwnerProperties.h",
       "web/WebFrameSerializer.h",
       "web/WebFrameSerializerClient.h",
       "web/WebFrameWidget.h",
       "web/WebGeolocationClient.h",
       "web/WebGeolocationController.h",
       "web/WebGeolocationError.h",
       "web/WebGeolocationPermissionRequest.h",
       "web/WebGeolocationPermissionRequestManager.h",
@@ skipping 107 matching lines @@
       "web/modules/serviceworker/WebServiceWorkerContextClient.h",
       "web/modules/serviceworker/WebServiceWorkerContextProxy.h",
       "web/modules/serviceworker/WebServiceWorkerNetworkProvider.h",
       "web/modules/webmidi/WebMIDIClient.h",
       "web/modules/webmidi/WebMIDIOptions.h",
       "web/modules/webmidi/WebMIDIPermissionRequest.h",
       "web/win/WebFontRendering.h",
     ],
   },
 }