Move SessionStorageNamespace entirely into NavigationController and support StoragePartitions.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index f5e684979b879e2c627956011e3d03c741494e40..93371748343b950001738033f271680a0685d483 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -274,6 +274,21 @@ class CONTENT_EXPORT ContentBrowserClient {
       content::BrowserContext* browser_context,
       int child_process_id);
 
+  // Same as GetStoragePartitionIdForChildProcess(), but uses a SiteInstance
+  // instead.
+  //
+  // TODO(ajwong): Replace all uses of GetStoragePartitionIdForChildProcess()
+  // with this one.
+  virtual std::string GetStoragePartitionIdForSiteInstance(
+      content::BrowserContext* browser_context,
+      content::SiteInstance* instance);
+
+  // Allows the embedder to provide a validation check for |partition_id|s.
+  // This domain of valid entries should match the range of outputs for
+  // GetStoragePartitionIdForChildProcess().
+  virtual bool IsValidStoragePartitionId(BrowserContext* browser_context,
+                                         const std::string& partition_id);
+
   // Create and return a new quota permission context.
   virtual QuotaPermissionContext* CreateQuotaPermissionContext();