Ensure that isolated apps use the right cookies for media requests.

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 2a143f16d7a3e0b506fbdcc26da92fa83473156a..9c8ba9fc2c3230e069ead97deec4017e38e48015 100644
--- a/content/browser/resource_context_impl.cc
+++ b/content/browser/resource_context_impl.cc
@@ -277,6 +277,8 @@ void InitializeResourceContext(BrowserContext* browser_context) {
 
   // Add content's URLRequestContext's hooks.
   // Check first to avoid memory leak in unittests.
+  // TODO(creis): Do equivalent initializations for isolated app and isolated
+  // media request contexts.
   if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
@@ -288,7 +290,7 @@ void InitializeResourceContext(BrowserContext* browser_context) {
         base::Bind(&InitializeRequestContext,
                    resource_context,
                    make_scoped_refptr(
-                       browser_context->GetRequestContextForMedia())));
+                       browser_context->GetDefaultRequestContextForMedia())));
   }
 }