Simplify callback style in DomDistiller tests

components/dom_distiller/content/distiller_page_web_contents_browsertest.cc

 // Copyright 2013 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 "base/memory/weak_ptr.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "components/dom_distiller/content/distiller_javascript_utils.h"
@@ skipping 73 matching lines @@
   void SetUpOnMainThread() override {
     if (!DistillerJavaScriptWorldIdIsSet()) {
       SetDistillerJavaScriptWorldId(content::ISOLATED_WORLD_ID_CONTENT_END);
     }
     AddComponentsResources();
     SetUpTestServer();
     ContentBrowserTest::SetUpOnMainThread();
   }
 
   void DistillPage(const base::Closure& quit_closure, const std::string& url) {
-    quit_closure_ = quit_closure;
     distiller_page_->DistillPage(
         embedded_test_server()->GetURL(url),
         dom_distiller::proto::DomDistillerOptions(),
         base::Bind(&DistillerPageWebContentsTest::OnPageDistillationFinished,
-                   this));
+                   this, quit_closure));
   }
 
   void OnPageDistillationFinished(
+      base::Closure quit_closure,
       scoped_ptr<proto::DomDistillerResult> distiller_result,
       bool distillation_successful) {
     distiller_result_ = distiller_result.Pass();
-    quit_closure_.Run();
+    quit_closure.Run();
   }
 
   void OnJsExecutionDone(base::Closure callback, const base::Value* value) {
     js_result_.reset(value->DeepCopy());
     callback.Run();
   }
 
  private:
   void AddComponentsResources() {
     base::FilePath pak_file;
@@ skipping 20 matching lines @@
     ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
   }
 
  protected:
   void RunUseCurrentWebContentsTest(const std::string& url,
                                     bool expect_new_web_contents,
                                     bool setup_main_frame_observer,
                                     bool wait_for_document_loaded);
 
   DistillerPageWebContents* distiller_page_;
-  base::Closure quit_closure_;
   scoped_ptr<proto::DomDistillerResult> distiller_result_;
   scoped_ptr<base::Value> js_result_;
 };
 
 // Use this class to be able to leak the WebContents, which is needed for when
 // the current WebContents is used for distillation.
 class TestDistillerPageWebContents : public DistillerPageWebContents {
  public:
   TestDistillerPageWebContents(
       content::BrowserContext* browser_context,
@@ skipping 358 matching lines @@
   ASSERT_TRUE(js_result_);
   ASSERT_TRUE(js_result_->GetAsDictionary(&dict));
 
   ASSERT_TRUE(dict->HasKey("success"));
   bool success;
   ASSERT_TRUE(dict->GetBoolean("success", &success));
   EXPECT_TRUE(success);
 }
 
 }  // namespace dom_distiller