Convert ProtocolHandlerRegistry to be a ProfileKeyedService.

chrome/browser/profiles/profile.h

Index: chrome/browser/profiles/profile.h
diff --git a/chrome/browser/profiles/profile.h b/chrome/browser/profiles/profile.h
index d84c9a0ef9b92cf9eaa6d4b712b108dfda97d488..fdb74a8a34b8bc5bc3938b866a6a803b05076e32 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -296,6 +296,7 @@ class Profile : public content::BrowserContext {
   virtual BookmarkModel* GetBookmarkModel() = 0;
 
   // Returns the ProtocolHandlerRegistry, creating if not yet created.
+  // TODO(smckay): replace this with access via ProtocolHandlerRegistryFactory.
   virtual ProtocolHandlerRegistry* GetProtocolHandlerRegistry() = 0;
 
   // Return whether 2 profiles are the same. 2 profiles are the same if they
@@ -321,6 +322,8 @@ class Profile : public content::BrowserContext {
 
   // Register URLRequestFactories for protocols registered with
   // registerProtocolHandler.
+  // TODO(smckay): determine if this is ever called publicly, else
+  // we can nuke this interface element and internalize the calls.
   virtual void InitRegisteredProtocolHandlers() = 0;
 
   // Returns the last directory that was chosen for uploading or opening a file.