Refactoring: Generalize CachedSVGDocument for non-SVG use.

Source/core/core.gypi

 
 {
     'variables': {
         'core_idl_files': [
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
@@ skipping 1065 matching lines @@
             'loader/appcache/DOMApplicationCache.h',
             'loader/archive/ArchiveResource.cpp',
             'loader/archive/ArchiveResourceCollection.cpp',
             'loader/archive/ArchiveResourceCollection.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/CachedDocument.cpp',
+            'loader/cache/CachedDocument.h',
             'loader/cache/CachedFont.cpp',
             'loader/cache/CachedFont.h',
             'loader/cache/CachedImage.cpp',
             'loader/cache/CachedRawResource.cpp',
             'loader/cache/CachedResource.cpp',
             'loader/cache/CachedResourceClientWalker.h',
             'loader/cache/CachedResourceHandle.cpp',
             'loader/cache/CachedResourceLoader.cpp',
             'loader/cache/CachedResourceRequest.cpp',
             'loader/cache/CachedResourceInitiatorInfo.h',
             'loader/cache/CachedResourceRequestInitiators.cpp',
             'loader/cache/CachedScript.cpp',
             'loader/cache/CachedScript.h',
             'loader/cache/CachedShader.cpp',
             'loader/cache/CachedShader.h',
-            'loader/cache/CachedSVGDocument.cpp',
-            'loader/cache/CachedSVGDocument.h',
             'loader/cache/CachedSVGDocumentReference.h',
             'loader/cache/CachedTextTrack.cpp',
             'loader/cache/CachedTextTrack.h',
             'loader/cache/CachedXSLStyleSheet.cpp',
             'loader/cache/CachedXSLStyleSheet.h',
             'loader/cache/MemoryCache.cpp',
             'page/AutoscrollController.cpp',
             'page/AutoscrollController.h',
             'page/BarProp.cpp',
             'page/BarProp.h',
@@ skipping 2574 matching lines @@
                 '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++"'
               }],
          ],
     }
 }