Move mock_special_storage_policy from webkit/ to content/public/test/

webkit/browser/database/database_tracker.h

Index: webkit/browser/database/database_tracker.h
diff --git a/webkit/browser/database/database_tracker.h b/webkit/browser/database/database_tracker.h
index 8223d1ca9eacc81872308e4167406ba720ed114e..25d4986800267c993428f81ce30a083c9125199e 100644
--- a/webkit/browser/database/database_tracker.h
+++ b/webkit/browser/database/database_tracker.h
@@ -26,6 +26,10 @@ namespace base {
 class MessageLoopProxy;
 }
 
+namespace content {
+class DatabaseTracker_TestHelper_Test;
+}
+
 namespace sql {
 class Connection;
 class MetaTable;
@@ -179,7 +183,8 @@ class WEBKIT_STORAGE_BROWSER_EXPORT DatabaseTracker
 
  private:
   friend class base::RefCountedThreadSafe<DatabaseTracker>;
-  friend class MockDatabaseTracker;  // for testing
+  friend class content::DatabaseTracker_TestHelper_Test;
+  friend class MockDatabaseTracker; // for testing
 
   typedef std::map<std::string, std::set<base::string16> > DatabaseSet;
   typedef std::vector<std::pair<net::CompletionCallback, DatabaseSet> >