Ensure all content_browsertests call the host resolver in SetUpOnMainThread and not after.

content/browser/renderer_host/render_widget_host_view_browsertest.cc

 // Copyright (c) 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 <stdint.h>
 #include <utility>
 
 #include "base/barrier_closure.h"
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 214 matching lines @@
     IPC_BEGIN_MESSAGE_MAP(CommitBeforeSwapAckSentHelper, message)
       IPC_MESSAGE_HANDLER_GENERIC(FrameHostMsg_DidCommitProvisionalLoad,
                                   WaitForSwapCompositorFrame())
     IPC_END_MESSAGE_MAP()
     return false;
   }
 
   DISALLOW_COPY_AND_ASSIGN(CommitBeforeSwapAckSentHelper);
 };
 
-using RenderWidgetHostViewBrowserTestBase = ContentBrowserTest;
+class RenderWidgetHostViewBrowserTestBase : public ContentBrowserTest {
+ public:
+  ~RenderWidgetHostViewBrowserTestBase() override {}
+
+ protected:
+  void SetUpOnMainThread() override {
+    host_resolver()->AddRule("*", "127.0.0.1");
+  }
+};
 
 IN_PROC_BROWSER_TEST_F(RenderWidgetHostViewBrowserTestBase,
                        CompositorWorksWhenReusingRenderer) {
-  host_resolver()->AddRule("*", "127.0.0.1");
   ASSERT_TRUE(embedded_test_server()->Start());
   auto* web_contents = shell()->web_contents();
   // Load a page that draws new frames infinitely.
   NavigateToURL(shell(),
                 embedded_test_server()->GetURL("/page_with_animation.html"));
 
   // Open a new page in the same renderer to keep it alive.
   WebContents::CreateParams new_contents_params(
       web_contents->GetBrowserContext(), web_contents->GetSiteInstance());
   std::unique_ptr<WebContents> new_web_contents(
@@ skipping 751 matching lines @@
                         kTestCompositingModes);
 INSTANTIATE_TEST_CASE_P(
     GLAndSoftwareCompositing,
     CompositingRenderWidgetHostViewBrowserTestTabCaptureHighDPI,
     kTestCompositingModes);
 
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace
 }  // namespace content