Adding session-only localStorage.

content/browser/content_browser_client.h

Index: content/browser/content_browser_client.h
diff --git a/content/browser/content_browser_client.h b/content/browser/content_browser_client.h
index b4ff3953269850e660580c1b3e5412cc4da5281f..1dbf1fd0d1506620c2cb44a153c9b122d3a9b805 100644
--- a/content/browser/content_browser_client.h
+++ b/content/browser/content_browser_client.h
@@ -148,6 +148,13 @@ class ContentBrowserClient {
   virtual bool AllowSaveLocalState(
       const content::ResourceContext& context) = 0;
 
+  // Allow the embedder to restrict the given url to use only session-only
+  // storage.
+  virtual bool EnforceSessionOnlyStorage(
+      const GURL& url,
+      const GURL& first_party,
+      const content::ResourceContext& context) = 0;
+
   // Allows the embedder to override the request context based on the URL for
   // certain operations, like cookie access. Returns NULL to indicate the
   // regular request context should be used.