Abstract WebContentsObserver from Autofill shared code

components/autofill/browser/autocomplete_history_manager.h

Index: components/autofill/browser/autocomplete_history_manager.h
diff --git a/components/autofill/browser/autocomplete_history_manager.h b/components/autofill/browser/autocomplete_history_manager.h
index 9a55fa44b7dfd4cde12625f850f5c9b5f11ab38a..7e5f149fd6b812ba5526a26a245929f288f28841 100644
--- a/components/autofill/browser/autocomplete_history_manager.h
+++ b/components/autofill/browser/autocomplete_history_manager.h
@@ -11,10 +11,10 @@
 #include "base/prefs/pref_member.h"
 #include "components/autofill/browser/webdata/autofill_webdata_service.h"
 #include "components/webdata/common/web_data_service_consumer.h"
-#include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 class BrowserContext;
+class WebContents;
 }
 
 namespace autofill {
@@ -25,15 +25,11 @@ struct FormData;
 // Per-tab Autocomplete history manager. Handles receiving form data
 // from the renderer and the storing and retrieving of form data
 // through WebDataServiceBase.
-class AutocompleteHistoryManager : public content::WebContentsObserver,
-                                   public WebDataServiceConsumer {
+class AutocompleteHistoryManager : public WebDataServiceConsumer {
  public:
   explicit AutocompleteHistoryManager(content::WebContents* web_contents);
   virtual ~AutocompleteHistoryManager();
 
-  // content::WebContentsObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-
   // WebDataServiceConsumer implementation.
   virtual void OnWebDataServiceRequestDone(
       WebDataServiceBase::Handle h,
@@ -60,15 +56,18 @@ class AutocompleteHistoryManager : public content::WebContentsObserver,
 
  protected:
   friend class AutofillManagerTest;
+  FRIEND_TEST_ALL_PREFIXES(AutocompleteHistoryManagerTest, ExternalDelegate);
 
   // Sends the given |suggestions| for display in the Autofill popup.
   void SendSuggestions(const std::vector<base::string16>* suggestions);
 
  private:
+
   // Cancels the currently pending WebDataService query, if there is one.
   void CancelPendingQuery();
 
   content::BrowserContext* browser_context_;
+  content::WebContents* web_contents_;
   scoped_refptr<AutofillWebDataService> autofill_data_;
 
   BooleanPrefMember autofill_enabled_;
@@ -87,6 +86,9 @@ class AutocompleteHistoryManager : public content::WebContentsObserver,
   // our behalf.  Weak.
   AutofillExternalDelegate* external_delegate_;
 
+  // Used by tests to disable sending IPC.
+  bool send_IPC_;
+
   DISALLOW_COPY_AND_ASSIGN(AutocompleteHistoryManager);
 };