Remove all direct references to NavigationController from the RenderViewHostM...

Remove all direct references to NavigationController from the RenderViewHostManager::Delegate class--shunt all direct uses of NavigationController through the Delegate abstraction to be implement in TabContents by adding some additional functions that need implementation in the RenderViewHostManager::Delegate class.

These functions include
    virtual Profile* GetProfileForRenderManager () const=0;
    virtual NavigationEntry* GetEntryAtOffsetForRenderManager(int offset)=0;
    virtual void NotifyRenderViewHostSwitchedFromRenderManager(RenderViewHostSwitchedDetails*details)=0;


BUG=22356
TEST=write an abstraction that implements the RenderViewHostManager::Delegate without referencing TabContents classes