Cleanup: Remove some unneeded Extension* class forward declarations.

chrome/browser/extensions/suspicious_extension_bubble_controller.cc

Index: chrome/browser/extensions/suspicious_extension_bubble_controller.cc
===================================================================
--- chrome/browser/extensions/suspicious_extension_bubble_controller.cc	(revision 269890)
+++ chrome/browser/extensions/suspicious_extension_bubble_controller.cc	(working copy)
@@ -17,10 +17,13 @@
 #include "content/public/browser/user_metrics.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_system.h"
+#include "extensions/common/extension.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
+using extensions::ExtensionMessageBubbleController;
+
 namespace {
 
 base::LazyInstance<std::set<Profile*> > g_shown_for_profiles =
@@ -29,6 +32,38 @@
 ////////////////////////////////////////////////////////////////////////////////
 // SuspiciousExtensionBubbleDelegate
 
+class SuspiciousExtensionBubbleDelegate
+    : public ExtensionMessageBubbleController::Delegate {
+ public:
+  explicit SuspiciousExtensionBubbleDelegate(Profile* profile);
+  virtual ~SuspiciousExtensionBubbleDelegate();
+
+  // ExtensionMessageBubbleController::Delegate methods.
+  virtual bool ShouldIncludeExtension(const std::string& extension_id) OVERRIDE;
+  virtual void AcknowledgeExtension(
+      const std::string& extension_id,
+      ExtensionMessageBubbleController::BubbleAction user_action) OVERRIDE;
+  virtual void PerformAction(const extensions::ExtensionIdList& list) OVERRIDE;
+  virtual base::string16 GetTitle() const OVERRIDE;
+  virtual base::string16 GetMessageBody() const OVERRIDE;
+  virtual base::string16 GetOverflowText(
+      const base::string16& overflow_count) const OVERRIDE;
+  virtual base::string16 GetLearnMoreLabel() const OVERRIDE;
+  virtual GURL GetLearnMoreUrl() const OVERRIDE;
+  virtual base::string16 GetActionButtonLabel() const OVERRIDE;
+  virtual base::string16 GetDismissButtonLabel() const OVERRIDE;
+  virtual bool ShouldShowExtensionList() const OVERRIDE;
+  virtual void LogExtensionCount(size_t count) OVERRIDE;
+  virtual void LogAction(
+      ExtensionMessageBubbleController::BubbleAction action) OVERRIDE;
+
+ private:
+  // Our profile. Weak, not owned by us.
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(SuspiciousExtensionBubbleDelegate);
+};
+
 SuspiciousExtensionBubbleDelegate::SuspiciousExtensionBubbleDelegate(
     Profile* profile)
     : profile_(profile) {}