Prerendered tabs use the same SessionStorage namespace as the tab that triggered the prerender.

chrome/browser/prerender/prerender_manager_unittest.cc

Index: chrome/browser/prerender/prerender_manager_unittest.cc
diff --git a/chrome/browser/prerender/prerender_manager_unittest.cc b/chrome/browser/prerender/prerender_manager_unittest.cc
index 28cf9f0874f9b2ae9bb1ca6f2860a3dbd00dd8a9..49e768f964dec7f1cdffb1c5f8af5096c0e70a36 100644
--- a/chrome/browser/prerender/prerender_manager_unittest.cc
+++ b/chrome/browser/prerender/prerender_manager_unittest.cc
@@ -24,8 +24,8 @@ class DummyPrerenderContents : public PrerenderContents {
                          PrerenderTracker* prerender_tracker,
                          const GURL& url,
                          FinalStatus expected_final_status)
-      : PrerenderContents(prerender_manager, prerender_tracker, NULL, url,
-                          GURL(), ORIGIN_LINK_REL_PRERENDER,
+      : PrerenderContents(prerender_manager, prerender_tracker,
+                          NULL, url, GURL(), ORIGIN_LINK_REL_PRERENDER,
                           PrerenderManager::kNoExperiment),
         has_started_(false),
         expected_final_status_(expected_final_status) {
@@ -36,7 +36,8 @@ class DummyPrerenderContents : public PrerenderContents {
   }
 
   virtual void StartPrerendering(
-      const RenderViewHost* source_render_view_host) OVERRIDE {
+      const RenderViewHost* source_render_view_host,
+      SessionStorageNamespace* session_storage_namespace) OVERRIDE {
     has_started_ = true;
   }