Move core url data manager classes to content.

content/browser/resource_context_impl.h

Index: content/browser/resource_context_impl.h
===================================================================
--- content/browser/resource_context_impl.h	(revision 178359)
+++ content/browser/resource_context_impl.h	(working copy)
@@ -7,6 +7,8 @@
 
 #include "content/public/browser/resource_context.h"
 
+class ChromeURLDataManagerBackend;
+
 namespace content {
 
 class ChromeBlobStorageContext;
@@ -22,6 +24,9 @@
 
 HostZoomMap* GetHostZoomMapForResourceContext(ResourceContext* context);
 
+ChromeURLDataManagerBackend* GetURLDataManagerForResourceContext(
+    ResourceContext* context);
+
 // Initialize the above data on the ResourceContext from a given BrowserContext.
 void InitializeResourceContext(BrowserContext* browser_context);