Script streaming: turn off cached data to prevent crashes.

Source/bindings/core/v8/ScriptStreamer.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "bindings/core/v8/ScriptStreamer.h"
 
 #include "bindings/core/v8/ScriptStreamerThread.h"
 #include "bindings/core/v8/V8ScriptRunner.h"
 #include "core/dom/Document.h"
@@ skipping 488 matching lines @@
 bool ScriptStreamer::startStreamingInternal(PendingScript& script, Settings* settings, ScriptState* scriptState, PendingScript::Type scriptType)
 {
     ASSERT(isMainThread());
     if (!settings || !settings->v8ScriptStreamingEnabled())
         return false;
     if (settings->v8ScriptStreamingMode() == ScriptStreamingModeOnlyAsyncAndDefer
         && scriptType == PendingScript::ParsingBlocking)
         return false;
 
     ScriptResource* resource = script.resource();
-    ASSERT(!resource->isLoaded());
+    if (resource->isLoaded())
+        return false;
     if (!resource->url().protocolIsInHTTPFamily())
         return false;
     if (resource->resourceToRevalidate()) {
         // This happens e.g., during reloads. We're actually not going to load
         // the current Resource of the PendingScript but switch to another
         // Resource -> don't stream.
         return false;
     }
     // We cannot filter out short scripts, even if we wait for the HTTP headers
     // to arrive. In general, the web servers don't seem to send the
@@ skipping 11 matching lines @@
 
     // The Resource might go out of scope if the script is no longer
     // needed. This makes PendingScript notify the ScriptStreamer when it is
     // destroyed.
     script.setStreamer(adoptRef(new ScriptStreamer(resource, scriptType, settings->v8ScriptStreamingMode(), scriptState, compileOption)));
 
     return true;
 }
 
 } // namespace blink