Cancel prerenders from Omnibox if we navigate to a different URL than predicted

chrome/browser/prerender/prerender_manager.h

Index: chrome/browser/prerender/prerender_manager.h
diff --git a/chrome/browser/prerender/prerender_manager.h b/chrome/browser/prerender/prerender_manager.h
index 03f73f46f09e1d30f2c216ffb80477b49e57109a..516cffe56c1741f92307b9736ac0b782ab762229 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -121,6 +121,9 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   // Cancels all active prerenders.
   void CancelAllPrerenders();
 
+  // Cancels all active prerenders with the ORIGIN_OMNIBOX origin.
+  void CancelOmniboxPrerenders();
+
   // For a given WebContents that wants to navigate to the URL supplied,
   // determines whether a prerendered version of the URL can be used,
   // and substitutes the prerendered RVH into the WebContents. |opener_url| is
@@ -221,6 +224,9 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
 
   bool IsPendingEntry(const GURL& url) const;
 
+  // Returns true if |url| matches any URLs being prerendered.
+  bool IsPrerendering(const GURL& url) const;
+
  protected:
   void SetPrerenderContentsFactory(
       PrerenderContents::Factory* prerender_contents_factory);
@@ -237,6 +243,11 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   // Test that needs needs access to internal functions.
   friend class PrerenderBrowserTest;
   FRIEND_TEST_ALL_PREFIXES(PrerenderManagerTest, AliasURLTest);
+  FRIEND_TEST_ALL_PREFIXES(PrerenderManagerTest, CancelAllTest);
+  FRIEND_TEST_ALL_PREFIXES(PrerenderManagerTest,
+                           CancelOmniboxRemovesOmniboxTest);
+  FRIEND_TEST_ALL_PREFIXES(PrerenderManagerTest,
+                           CancelOmniboxDoesNotRemoveLinkTest);
   FRIEND_TEST_ALL_PREFIXES(PrerenderManagerTest, ClearTest);
   FRIEND_TEST_ALL_PREFIXES(PrerenderManagerTest, ControlGroup);
   FRIEND_TEST_ALL_PREFIXES(PrerenderManagerTest, DropOldestRequestTest);
@@ -259,6 +270,8 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
 
   class MostVisitedSites;
 
+  typedef std::list<PrerenderContentsData> PrerenderContentsDataList;
+
   // Adds a prerender for |url| from referrer |referrer| initiated from the
   // RenderViewHost specified by |child_route_id_pair|. The |origin| specifies
   // how the prerender was added. If the |session_storage_namespace| is NULL,
@@ -271,14 +284,6 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
       const content::Referrer& referrer,
       SessionStorageNamespace* session_storage_namespace);
 
-  // Adds a pending preload issued by the prerendering RenderView identified by
-  // |child_route_id_pair|.  If and when that prerendering RenderView is used,
-  // the specified prerender will start.
-  void AddPendingPrerender(Origin origin,
-                           const std::pair<int, int>& child_route_id_pair,
-                           const GURL& url,
-                           const content::Referrer& referrer);
-
   // Retrieves the PrerenderContents object for the specified URL, if it
   // has been prerendered.  The caller will then have ownership of the
   // PrerenderContents object and is responsible for freeing it.
@@ -328,19 +333,14 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   // Finds the specified PrerenderContents and returns it, if it exists.
   // Returns NULL otherwise.  Unlike GetEntry, the PrerenderManager maintains
   // ownership of the PrerenderContents.
-  PrerenderContents* FindEntry(const GURL& url);
+  PrerenderContents* FindEntry(const GURL& url) const;
 
   // Returns the iterator to the PrerenderContentsData entry that is being
   // prerendered from the given child route id pair.
-  std::list<PrerenderContentsData>::iterator
+  PrerenderContentsDataList::iterator
       FindPrerenderContentsForChildRouteIdPair(
           const std::pair<int, int>& child_route_id_pair);
 
-  // Returns whether the PrerenderManager is currently within the prerender
-  // window - effectively, up to 30 seconds after a prerender tag has been
-  // observed.
-  bool WithinWindow() const;
-
   bool DoesRateLimitAllowPrerender() const;
 
   // Deletes old TabContents that have been replaced by prerendered ones.  This
@@ -399,7 +399,7 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   PrerenderTracker* prerender_tracker_;
 
   // List of prerendered elements.
-  std::list<PrerenderContentsData> prerender_list_;
+  PrerenderContentsDataList prerender_list_;
 
   // List of recent navigations in this profile, sorted by ascending
   // navigate_time_.