Move Data uri handling into WebCore

Source/WebCore/WebCore.gypi

 {
     'variables': {
         'webcore_idl_files': [
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSMediaRule.idl',
             'css/CSSPageRule.idl',
@@ skipping 1056 matching lines @@
             'loader/ThreadableLoaderClient.h',
             'loader/ThreadableLoaderClientWrapper.h',
             'loader/WorkerThreadableLoader.cpp',
             'loader/WorkerThreadableLoader.h',
             'loader/appcache/ApplicationCacheHost.h',
             'loader/appcache/DOMApplicationCache.cpp',
             'loader/appcache/DOMApplicationCache.h',
             'loader/archive/ArchiveResource.cpp',
             'loader/archive/ArchiveResourceCollection.cpp',
             'loader/archive/ArchiveResourceCollection.h',
+            'loader/DataUriResource.cpp',
+            'loader/DataUriResource.h',
             'loader/archive/MHTMLArchive.cpp',
             'loader/archive/MHTMLArchive.h',
             'loader/archive/MHTMLParser.cpp',
             'loader/archive/MHTMLParser.h',
             'loader/cache/CachedCSSStyleSheet.cpp',
             'loader/cache/CachedCSSStyleSheet.h',
             'loader/cache/CachedFont.cpp',
             'loader/cache/CachedFont.h',
             'loader/cache/CachedImage.cpp',
             'loader/cache/CachedRawResource.cpp',
@@ skipping 2687 matching lines @@
               'gperf_exe': 'gperf',
               'bison_exe': 'bison',
 
               # We specify a preprocess so it happens locally and won't get distributed to goma.
               # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to use /usr/bin/clang once we require Xcode 4.x.
               'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
             }],
         ],
     }
 }