Save extension activity log to a file.

chrome/browser/extensions/tab_helper.cc

Index: chrome/browser/extensions/tab_helper.cc
===================================================================
--- chrome/browser/extensions/tab_helper.cc	(revision 177317)
+++ chrome/browser/extensions/tab_helper.cc	(working copy)
@@ -103,9 +103,11 @@
         new ScriptBubbleController(web_contents, this));
   }
 
+
   // If more classes need to listen to global content script activity, then
   // a separate routing class with an observer interface should be written.
-  AddScriptExecutionObserver(ActivityLog::GetInstance());
+  profile_ = Profile::FromBrowserContext(web_contents->GetBrowserContext());
+  AddScriptExecutionObserver(ActivityLog::GetInstance(profile_));
 
   registrar_.Add(this,
                  content::NOTIFICATION_LOAD_STOP,
@@ -118,7 +120,7 @@
 }
 
 TabHelper::~TabHelper() {
-  RemoveScriptExecutionObserver(ActivityLog::GetInstance());
+  RemoveScriptExecutionObserver(ActivityLog::GetInstance(profile_));
 }
 
 void TabHelper::CreateApplicationShortcuts() {