Have ScriptStreamerTest go through ClassicPendingScript::Fetch()

This lets us get rid of the last non-trival usage of
ResourceClient::SetResource in ClassicPendingScript

Bug: 793028
Change-Id: I39a4859cb1b941ff6a399fad88d40e353df4d462
Reviewed-on: https://chromium-review.googlesource.com/822176Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Commit-Queue: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523569}

third_party/WebKit/Source/core/dom/ClassicPendingScript.cpp

@@ -54,18 +54,6 @@ ClassicPendingScript* ClassicPendingScript::Fetch(
   return pending_script;
 }
 
-ClassicPendingScript* ClassicPendingScript::CreateExternalForTest(
-    ScriptElementBase* element,
-    ScriptResource* resource) {
-  DCHECK(resource);
-  ClassicPendingScript* pending_script = new ClassicPendingScript(
-      element, TextPosition(), ScriptSourceLocationType::kExternalFile,
-      ScriptFetchOptions(), true /* is_external */);
-  pending_script->SetResource(resource);
-  pending_script->CheckState();
-  return pending_script;
-}
-
 ClassicPendingScript* ClassicPendingScript::CreateInline(
     ScriptElementBase* element,
     const TextPosition& starting_position,
@@ -114,7 +102,7 @@ void ClassicPendingScript::Prefinalize() {
 
 void ClassicPendingScript::DisposeInternal() {
   MemoryCoordinator::Instance().UnregisterClient(this);
-  SetResource(nullptr);
+  ClearResource();
   integrity_failure_ = false;
   CancelStreaming();
 }

third_party/WebKit/Source/core/dom/ClassicPendingScript.h

@@ -41,10 +41,6 @@ class CORE_EXPORT ClassicPendingScript final : public PendingScript,
                                      ScriptElementBase*,
                                      FetchParameters::DeferOption);
 
-  // For a script from an external file, with a supplied ScriptResource.
-  static ClassicPendingScript* CreateExternalForTest(ScriptElementBase*,
-                                                     ScriptResource*);
-
   // For an inline script.
   static ClassicPendingScript* CreateInline(ScriptElementBase*,
                                             const TextPosition&,