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

third_party/WebKit/Source/web/web.gypi

 {
   'variables': {
     'web_files': [
       'AssertMatchingEnums.cpp',
       'AssociatedURLLoader.cpp',
       'AssociatedURLLoader.h',
       'AudioOutputDeviceClientImpl.cpp',
       'AudioOutputDeviceClientImpl.h',
       'ChromeClientImpl.cpp',
       'ChromeClientImpl.h',
@@ skipping 128 matching lines @@
       'WebEntities.cpp',
       'WebEntities.h',
       'WebFileChooserCompletionImpl.cpp',
       'WebFileChooserCompletionImpl.h',
       'WebFontDescription.cpp',
       'WebFontImpl.cpp',
       'WebFontImpl.h',
       'WebFormControlElement.cpp',
       'WebFormElement.cpp',
       'WebFrame.cpp',
+      "WebFrameContentDumper.cpp",
       'WebFrameImplBase.cpp',
       'WebFrameImplBase.h',
       'WebFrameSerializer.cpp',
       'WebFrameSerializerImpl.cpp',
       'WebFrameSerializerImpl.h',
       'WebFrameWidgetImpl.cpp',
       'WebFrameWidgetImpl.h',
       'WebGeolocationController.cpp',
       'WebGeolocationError.cpp',
       'WebGeolocationPermissionRequest.cpp',
@@ skipping 149 matching lines @@
       'tests/sim/SimNetwork.h',
       'tests/sim/SimRequest.cpp',
       'tests/sim/SimRequest.h',
       'tests/sim/SimTest.cpp',
       'tests/sim/SimTest.h',
       'tests/sim/SimWebViewClient.cpp',
       'tests/sim/SimWebViewClient.h',
     ],
   },
 }