Webview tag creation should be using storage partitions.

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index bc27f4431a94f3203ff05ab279e14a1d21ba603e..aa63c08feb79122212dae2eb4991da47d8d4d6cf 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -160,12 +160,6 @@ net::URLRequestContext* ContentBrowserClient::OverrideRequestContextForURL(
   return NULL;
 }
 
-std::string ContentBrowserClient::GetStoragePartitionIdForChildProcess(
-    BrowserContext* browser_context,
-    int child_process_id) {
-  return std::string();
-}
-
 std::string ContentBrowserClient::GetStoragePartitionIdForSite(
     BrowserContext* browser_context,
     const GURL& site) {
@@ -180,6 +174,17 @@ bool ContentBrowserClient::IsValidStoragePartitionId(
   return partition_id.empty();
 }
 
+void ContentBrowserClient::GetStoragePartitionConfigForSite(
+    BrowserContext* browser_context,
+    const GURL& site,
+    std::string* partition_domain,
+    std::string* partition_name,
+    bool* in_memory) {
+  *partition_domain = std::string();
+  *partition_name = std::string();
+  *in_memory = false;
+}
+
 MediaObserver* ContentBrowserClient::GetMediaObserver() {
   return NULL;
 }