Cleanup: Pull some browser keep alive functions into its own file.

chrome/browser/ui/app_list/profile_loader.h

Index: chrome/browser/ui/app_list/profile_loader.h
diff --git a/chrome/browser/ui/app_list/profile_loader.h b/chrome/browser/ui/app_list/profile_loader.h
index 724ea825bd7b0d63605e3b024fe36b8e5b351400..c9a07f2e871b6220a064364de9bae8b9482d00af 100644
--- a/chrome/browser/ui/app_list/profile_loader.h
+++ b/chrome/browser/ui/app_list/profile_loader.h
@@ -12,10 +12,13 @@ namespace base {
 class FilePath;
 }
 
+namespace browser_lifetime {
+class ScopedKeepAlive;
+}
+
 class Profile;
 class ProfileLoaderUnittest;
 class ProfileStore;
-class ScopedKeepAlive;
 
 // This class loads profiles asynchronously and calls the provided callback once
 // the profile is ready. Only the callback for the most recent load request is
@@ -46,7 +49,7 @@ class ProfileLoader {
   void DecrementPendingProfileLoads();
 
   ProfileStore* profile_store_;
-  scoped_ptr<ScopedKeepAlive> keep_alive_;
+  scoped_ptr<browser_lifetime::ScopedKeepAlive> keep_alive_;
   int profile_load_sequence_id_;
   int pending_profile_loads_;