Fix some WebContents leaks in prerendering tests

chrome/browser/android/offline_pages/prerender_adapter_unittest.cc

 // Copyright 2016 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 "chrome/browser/android/offline_pages/prerender_adapter.h"
 
 #include "base/sys_info.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 183 matching lines @@
 
   prerender_manager()->SetMode(PrerenderManager::PRERENDER_MODE_DISABLED);
   EXPECT_FALSE(adapter()->CanPrerender());
 }
 
 TEST_F(PrerenderAdapterTest, StartPrerenderFailsForUnsupportedScheme) {
   // Skip test on low end device until supported.
   if (base::SysInfo::IsLowEndDevice())
     return;
 
-  content::WebContents* session_contents = content::WebContents::Create(
-      content::WebContents::CreateParams(profile()));
+  std::unique_ptr<content::WebContents> session_contents(
+      content::WebContents::Create(
+          content::WebContents::CreateParams(profile())));
   content::SessionStorageNamespace* sessionStorageNamespace =
       session_contents->GetController().GetDefaultSessionStorageNamespace();
   gfx::Size renderWindowSize = session_contents->GetContainerBounds().size();
   GURL url("file://file.test");
   EXPECT_FALSE(adapter()->StartPrerender(
       profile(), url, sessionStorageNamespace, renderWindowSize));
   EXPECT_TRUE(prerender_contents_factory()->create_prerender_contents_called());
   EXPECT_FALSE(adapter()->IsActive());
 }
 
 TEST_F(PrerenderAdapterTest, StartPrerenderSucceeds) {
   // Skip test on low end device until supported.
   if (base::SysInfo::IsLowEndDevice())
     return;
 
-  content::WebContents* session_contents = content::WebContents::Create(
-      content::WebContents::CreateParams(profile()));
+  std::unique_ptr<content::WebContents> session_contents(
+      content::WebContents::Create(
+          content::WebContents::CreateParams(profile())));
   content::SessionStorageNamespace* sessionStorageNamespace =
       session_contents->GetController().GetDefaultSessionStorageNamespace();
   gfx::Size renderWindowSize = session_contents->GetContainerBounds().size();
   GURL url("https://url.test");
   EXPECT_TRUE(adapter()->StartPrerender(profile(), url, sessionStorageNamespace,
                                         renderWindowSize));
   EXPECT_TRUE(prerender_contents_factory()->create_prerender_contents_called());
   EXPECT_NE(nullptr, prerender_contents_factory()->last_prerender_contents());
   EXPECT_TRUE(adapter()->IsActive());
   EXPECT_FALSE(observer_stop_loading_called());
@@ skipping 13 matching lines @@
   EXPECT_EQ(FinalStatus::FINAL_STATUS_CANCELLED, adapter()->GetFinalStatus());
 
   // Exercise access methods even though no interesting values set beneath.
   EXPECT_EQ(nullptr, adapter()->GetWebContents());
 
   adapter()->DestroyActive();
   EXPECT_FALSE(adapter()->IsActive());
 }
 
 }  // namespace offline_pages