ServiceWorker: Factor out FetchEvent related logics from RespondWithObserver.

third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp

Index: third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp
diff --git a/third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp b/third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp
index 77df99ec57b377fd1ce1b346d619c5c82849c293..066ece3338f87bf3745e4f81c75bb4801122eb48 100644
--- a/third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp
+++ b/third_party/WebKit/Source/web/ServiceWorkerGlobalScopeProxy.cpp
@@ -164,7 +164,7 @@ void ServiceWorkerGlobalScopeProxy::dispatchFetchEvent(
       workerGlobalScope()->scriptController()->getScriptState());
   WaitUntilObserver* waitUntilObserver = WaitUntilObserver::create(
       workerGlobalScope(), WaitUntilObserver::Fetch, fetchEventID);
-  RespondWithObserver* respondWithObserver = RespondWithObserver::create(
+  RespondWithObserver* respondWithObserver = FetchRespondWithObserver::create(

[nhiroki, 2017/03/08 01:49:04]

Can you replace RespondWithObserver* with FetchRespondWithObserver*?

It'd be better to use the concrete class name instead of the base class name as
much as possible in terms of readability and compilability. If this change
affects wide areas, a separate CL is ok.

[zino, 2017/03/10 17:57:17]

Done.

       workerGlobalScope(), fetchEventID, webRequest.url(), webRequest.mode(),
       webRequest.redirectMode(), webRequest.frameType(),
       webRequest.requestContext(), waitUntilObserver);