Adding session-only localStorage.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 6b5faf4d08e0632872916c9c6003ce6cd81d2501..45af44e1889e5acd5bff7bba2940f4f5a6bcecc7 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -474,6 +474,19 @@ bool ChromeContentBrowserClient::AllowSaveLocalState(
   return !io_data->clear_local_state_on_exit()->GetValue();
 }
 
+bool ChromeContentBrowserClient::EnforceSessionOnlyStorage(
+    const GURL& url,
+    const GURL& first_party_url,
+    const content::ResourceContext& context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  ProfileIOData* io_data =
+      reinterpret_cast<ProfileIOData*>(context.GetUserData(NULL));
+  ContentSetting setting = io_data->GetHostContentSettingsMap()->
+      GetCookieContentSetting(url, first_party_url, true);
+
+  return (setting == CONTENT_SETTING_SESSION_ONLY);
+}
+
 net::URLRequestContext*
 ChromeContentBrowserClient::OverrideRequestContextForURL(
     const GURL& url, const content::ResourceContext& context) {