Shuffle media-related WebMimeRegistry code from webkit/ to content/.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 31dd79161698a8dcdeb96f2d74da0fe94086851e..b7984cefda9e15d1d7c48fcf83f563d00152a32e 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -32,7 +32,6 @@ class WebHyphenator;
 class WebMediaPlayerClient;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
-class WebMimeRegistry;
 class WebPlugin;
 class WebPluginContainer;
 class WebPrescientNetworking;
@@ -149,10 +148,6 @@ class CONTENT_EXPORT ContentRendererClient {
   // returns NULL the content layer will handle clipboard interactions.
   virtual WebKit::WebClipboard* OverrideWebClipboard();
 
-  // Allows the embedder to override the WebKit::WebMimeRegistry used. If it
-  // returns NULL the content layer will provide its own mime registry.
-  virtual WebKit::WebMimeRegistry* OverrideWebMimeRegistry();
-
   // Allows the embedder to override the WebKit::WebHyphenator used. If it
   // returns NULL the content layer will handle hyphenation.
   virtual WebKit::WebHyphenator* OverrideWebHyphenator();