Use per-frame TaskRunner instead of thread's default in DataConsumerHandle

third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp

Index: third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
index ff39381267a7782827829431a53b43ba753b8c95..d80e803985535212511073113a04095c2e889992 100644
--- a/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/DocumentThreadableLoader.cpp
@@ -69,7 +69,8 @@ private:
     public:
         explicit EmptyDataReader(WebDataConsumerHandle::Client* client) : m_factory(this)
         {
-            Platform::current()->currentThread()->getWebTaskRunner()->postTask(BLINK_FROM_HERE, WTF::bind(&EmptyDataReader::notify, m_factory.createWeakPtr(), WTF::unretained(client)));
+            if (client)
+                client->getTaskRunner()->postTask(BLINK_FROM_HERE, WTF::bind(&EmptyDataReader::notify, m_factory.createWeakPtr(), WTF::unretained(client)));
         }
     private:
         Result beginRead(const void** buffer, WebDataConsumerHandle::Flags, size_t *available) override
@@ -84,7 +85,8 @@ private:
         }
         void notify(WebDataConsumerHandle::Client* client)
         {
-            client->didGetReadable();
+            if (client)
+                client->didGetReadable();
         }
         WeakPtrFactory<EmptyDataReader> m_factory;
     };