Fail gracefully if InitializeResourceContext ends up calling itself recursively.

content/browser/resource_context_impl.cc

Index: content/browser/resource_context_impl.cc
diff --git a/content/browser/resource_context_impl.cc b/content/browser/resource_context_impl.cc
index 525a10a02774b80c684b099d456c8ab38ed599d9..8a2adfb31f0ff81bad3f121c3bb258bfa2cdd2d6 100644
--- a/content/browser/resource_context_impl.cc
+++ b/content/browser/resource_context_impl.cc
@@ -79,9 +79,12 @@ HostZoomMap* GetHostZoomMapForResourceContext(ResourceContext* context) {
       context->GetUserData(kHostZoomMapKeyName))->host_zoom_map();
 }
 
-void InitializeResourceContext(BrowserContext* browser_context) {
+void EnsureResourceContextInitialized(BrowserContext* browser_context) {
   ResourceContext* resource_context = browser_context->GetResourceContext();
-  DCHECK(!resource_context->GetUserData(kWebKitContextKeyName));
+
+  if (resource_context->GetUserData(kWebKitContextKeyName))
+    return;
+
   resource_context->SetUserData(
       kWebKitContextKeyName,
       new UserDataAdapter<WebKitContext>(