Create only one ContextFactory in content unit tests

content/browser/frame_host/navigator_impl_unittest.cc

 // 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 <stdint.h>
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "content/browser/frame_host/navigation_controller_impl.h"
@@ skipping 30 matching lines @@
 
 namespace content {
 
 class NavigatorTestWithBrowserSideNavigation
     : public RenderViewHostImplTestHarness {
  public:
   using SiteInstanceDescriptor = RenderFrameHostManager::SiteInstanceDescriptor;
   using SiteInstanceRelation = RenderFrameHostManager::SiteInstanceRelation;
 
   void SetUp() override {
-#if !defined(OS_ANDROID)
-    ImageTransportFactory::InitializeForUnitTests(
-        std::unique_ptr<ImageTransportFactory>(
-            new NoTransportImageTransportFactory));
-#endif
     EnableBrowserSideNavigation();
     RenderViewHostImplTestHarness::SetUp();
   }
 
   void TearDown() override {
     RenderViewHostImplTestHarness::TearDown();
-#if !defined(OS_ANDROID)
-    ImageTransportFactory::Terminate();
-#endif
   }
 
   TestNavigationURLLoader* GetLoaderForNavigationRequest(
       NavigationRequest* request) const {
     return static_cast<TestNavigationURLLoader*>(request->loader_for_testing());
   }
 
   // Requests a navigation of the specified FrameTreeNode to the specified URL;
   // returns the unique ID of the pending NavigationEntry.
   int RequestNavigation(FrameTreeNode* node, const GURL& url) {
@@ skipping 1086 matching lines @@
   main_test_rfh()->PrepareForCommit();
 
   // Claim that the navigation was within same page.
   int bad_msg_count = process()->bad_msg_count();
   GetSpeculativeRenderFrameHost(node)->SendNavigateWithModificationCallback(
       0, entry_id, true, kUrl2, base::Bind(SetWithinPage, kUrl1));
   EXPECT_EQ(process()->bad_msg_count(), bad_msg_count + 1);
 }
 
 }  // namespace content