Refactoring: Generalize CachedSVGDocument for non-SVG use.

Source/core/loader/cache/CachedResourceLoader.h

Index: Source/core/loader/cache/CachedResourceLoader.h
diff --git a/Source/core/loader/cache/CachedResourceLoader.h b/Source/core/loader/cache/CachedResourceLoader.h
index ef3457aea4be721be553ba608f37c54a4949a1ce..acd4fd6cee7157eb1ed125d1a1712f0505bd1e25 100644
--- a/Source/core/loader/cache/CachedResourceLoader.h
+++ b/Source/core/loader/cache/CachedResourceLoader.h
@@ -42,7 +42,7 @@
 namespace WebCore {
 
 class CachedCSSStyleSheet;
-class CachedSVGDocument;
+class CachedDocument;
 class CachedFont;
 class CachedImage;
 class CachedRawResource;
@@ -80,7 +80,7 @@ public:
     CachedResourceHandle<CachedFont> requestFont(CachedResourceRequest&);
     CachedResourceHandle<CachedRawResource> requestRawResource(CachedResourceRequest&);
     CachedResourceHandle<CachedRawResource> requestMainResource(CachedResourceRequest&);
-    CachedResourceHandle<CachedSVGDocument> requestSVGDocument(CachedResourceRequest&);
+    CachedResourceHandle<CachedDocument> requestSVGDocument(CachedResourceRequest&);
     CachedResourceHandle<CachedXSLStyleSheet> requestXSLStyleSheet(CachedResourceRequest&);
     CachedResourceHandle<CachedResource> requestLinkResource(CachedResource::Type, CachedResourceRequest&);
     CachedResourceHandle<CachedTextTrack> requestTextTrack(CachedResourceRequest&);