Make session restore understand that tabs have multiple SessionStorageNamespaces.

content/browser/browser_context.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/browser/browser_context.h"
 
 #include "content/browser/appcache/chrome_appcache_service.h"
 #include "webkit/database/database_tracker.h"
 #include "content/browser/dom_storage/dom_storage_context_impl.h"
 #include "content/browser/download/download_file_manager.h"
@@ skipping 193 matching lines @@
 fileapi::FileSystemContext* BrowserContext::GetFileSystemContext(
     BrowserContext* browser_context) {
   // TODO(ajwong): Change this API to require a process id instead of using
   // kInvalidChildProcessId.
   StoragePartition* partition =
       GetStoragePartition(browser_context,
                           ChildProcessHostImpl::kInvalidChildProcessId);
   return partition->filesystem_context();
 }
 
+bool BrowserContext::IsValidStoragePartitionId(
+    BrowserContext* browser_context,
+    const std::string& partition_id) {
+  return GetContentClient()->browser()->IsValidStoragePartitionId(
+      browser_context, partition_id);
+}
+
 void BrowserContext::EnsureResourceContextInitialized(BrowserContext* context) {
   // This will be enough to tickle initialization of BrowserContext if
   // necessary, which initializes ResourceContext. The reason we don't call
   // ResourceContext::InitializeResourceContext directly here is that if
   // ResourceContext ends up initializing it will call back into BrowserContext
   // and when that call returns it'll end rewriting its UserData map (with the
   // same value) but this causes a race condition. See http://crbug.com/115678.
   GetStoragePartition(context, ChildProcessHostImpl::kInvalidChildProcessId);
 }
 
@@ skipping 33 matching lines @@
   ForEachDOMStorageContext(browser_context,
                            base::Bind(&DOMStorageContextImpl::PurgeMemory));
 }
 
 BrowserContext::~BrowserContext() {
   if (GetUserData(kDownloadManagerKeyName))
     GetDownloadManager(this)->Shutdown();
 }
 
 }  // namespace content