Avoid leaking TestWebIDBFactory instances, and reset

webkit/support/test_webkit_platform_support.cc

Index: webkit/support/test_webkit_platform_support.cc
===================================================================
--- webkit/support/test_webkit_platform_support.cc	(revision 179816)
+++ webkit/support/test_webkit_platform_support.cc	(working copy)
@@ -405,7 +405,9 @@
 };
 
 WebKit::WebIDBFactory* TestWebKitPlatformSupport::idbFactory() {
-  return new TestWebIDBFactory();
+  if (!idb_factory_)
+    idb_factory_.reset(new TestWebIDBFactory());
+  return idb_factory_.get();
 }
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
@@ -611,3 +613,7 @@
   // Caller will retain and release.
   return new WebGestureCurveMock(velocity, cumulative_scroll);
 }
+
+void TestWebKitPlatformSupport::ResetIDBFactory() {
+  idb_factory_.reset();
+}