TaskManager: Remove some unused/unnecessary methods.

chrome/browser/task_manager/tab_contents_resource_provider.cc

Index: chrome/browser/task_manager/tab_contents_resource_provider.cc
diff --git a/chrome/browser/task_manager/tab_contents_resource_provider.cc b/chrome/browser/task_manager/tab_contents_resource_provider.cc
index 97824dc45eb9ee5c112514e152fee195c620e5f2..fdd6e9c566708bf64af13ee3d7631d8e938ed0ac 100644
--- a/chrome/browser/task_manager/tab_contents_resource_provider.cc
+++ b/chrome/browser/task_manager/tab_contents_resource_provider.cc
@@ -79,7 +79,6 @@ class TabContentsResource : public RendererResource {
   virtual base::string16 GetProfileName() const OVERRIDE;
   virtual gfx::ImageSkia GetIcon() const OVERRIDE;
   virtual content::WebContents* GetWebContents() const OVERRIDE;
-  virtual const extensions::Extension* GetExtension() const OVERRIDE;
 
  private:
   // Returns true if contains content rendered by an extension.
@@ -155,16 +154,6 @@ WebContents* TabContentsResource::GetWebContents() const {
   return web_contents_;
 }
 
-const Extension* TabContentsResource::GetExtension() const {
-  if (HostsExtension()) {
-    ExtensionService* extension_service = profile_->GetExtensionService();
-    return extension_service->extensions()->GetByID(
-        web_contents_->GetURL().host());
-  }
-
-  return NULL;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // TabContentsResourceProvider class
 ////////////////////////////////////////////////////////////////////////////////