[Extensions] Short-circuit activity logging if not enabled

extensions/browser/extensions_browser_client.h

Index: extensions/browser/extensions_browser_client.h
diff --git a/extensions/browser/extensions_browser_client.h b/extensions/browser/extensions_browser_client.h
index 66a6ce526e3431eb790be624d33b010ad874ceae..36ca246b2363d02dc1d2972dcde3ca7bb9d8c070 100644
--- a/extensions/browser/extensions_browser_client.h
+++ b/extensions/browser/extensions_browser_client.h
@@ -44,7 +44,6 @@ class UpdateClient;
 
 namespace extensions {
 
-class ApiActivityMonitor;
 class ComponentExtensionResourceManager;
 class Extension;
 class ExtensionCache;
@@ -177,11 +176,6 @@ class ExtensionsBrowserClient {
   // Return true if the user is logged in as a public session.
   virtual bool IsLoggedInAsPublicAccount() = 0;
 
-  // Returns the embedder's ApiActivityMonitor for |context|. Returns NULL if
-  // the embedder does not monitor extension API activity.
-  virtual ApiActivityMonitor* GetApiActivityMonitor(
-      content::BrowserContext* context) = 0;
-
   // Returns the factory that provides an ExtensionSystem to be returned from
   // ExtensionSystem::Get.
   virtual ExtensionSystemProvider* GetExtensionSystemFactory() = 0;