Move SessionStorageNamespace entirely into NavigationController and support StoragePartitions.

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index 6e4cb51ab9e90b20953237ac70632be5e9908b0e..bab993b9fc250040787ece4180685831a7a8f92e 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -37,6 +37,12 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
   virtual std::string GetStoragePartitionIdForChildProcess(
       content::BrowserContext* browser_context,
       int child_process_id) OVERRIDE;
+  virtual std::string GetStoragePartitionIdForSiteInstance(
+      content::BrowserContext* browser_context,
+      content::SiteInstance* instance) OVERRIDE;
+  virtual bool IsValidStoragePartitionId(
+      content::BrowserContext* browser_context,
+      const std::string& partition_id) OVERRIDE;
   virtual content::WebContentsViewDelegate* GetWebContentsViewDelegate(
       content::WebContents* web_contents) OVERRIDE;
   virtual void RenderViewHostCreated(