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

content/browser/loader/resource_dispatcher_host_browsertest.cc

 // Copyright (c) 2012 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 "content/public/browser/resource_dispatcher_host.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 855 matching lines @@
     ContentBrowserTest::SetUpOnMainThread();
 
     ASSERT_TRUE(embedded_test_server()->Start());
 
     delegate_.reset(new RequestDataResourceDispatcherHostDelegate());
 
     content::BrowserThread::PostTask(
         content::BrowserThread::IO, FROM_HERE,
         base::Bind(&RequestDataResourceDispatcherHostDelegate::SetDelegate,
                    base::Unretained(delegate_.get())));
+    host_resolver()->AddRule("*", "127.0.0.1");
   }
 
  protected:
   std::unique_ptr<RequestDataResourceDispatcherHostDelegate> delegate_;
 };
 
 IN_PROC_BROWSER_TEST_F(RequestDataResourceDispatcherHostBrowserTest, Basic) {
   GURL top_url(embedded_test_server()->GetURL("/page_with_subresources.html"));
   url::Origin top_origin(top_url);
 
@@ skipping 19 matching lines @@
     for (const auto& request : delegate_->data()) {
       SCOPED_TRACE(request->url);
       EXPECT_EQ(top_url, request->first_party);
       EXPECT_EQ(top_origin, request->initiator);
     }
   }
 }
 
 IN_PROC_BROWSER_TEST_F(RequestDataResourceDispatcherHostBrowserTest,
                        BasicCrossSite) {
-  host_resolver()->AddRule("*", "127.0.0.1");
   GURL top_url(embedded_test_server()->GetURL(
       "a.com", "/nested_page_with_subresources.html"));
   GURL nested_url(embedded_test_server()->GetURL(
       "not-a.com", "/page_with_subresources.html"));
   url::Origin top_origin(top_url);
   url::Origin nested_origin(nested_url);
 
   NavigateToURLBlockUntilNavigationsComplete(shell(), top_url, 1);
 
   EXPECT_EQ(9u, delegate_->data().size());
@@ skipping 166 matching lines @@
   if (IsBrowserSideNavigationEnabled()) {
     EXPECT_FALSE(delegate_->data()[0]->initiator.has_value());
   } else {
     ASSERT_TRUE(delegate_->data()[0]->initiator.has_value());
     EXPECT_EQ(top_origin, delegate_->data()[0]->initiator);
   }
 }
 
 IN_PROC_BROWSER_TEST_F(RequestDataResourceDispatcherHostBrowserTest,
                        CrossOriginNested) {
-  host_resolver()->AddRule("*", "127.0.0.1");
   GURL top_url(embedded_test_server()->GetURL(
       "a.com", "/cross_site_iframe_factory.html?a(b)"));
   GURL top_js_url(
       embedded_test_server()->GetURL("a.com", "/tree_parser_util.js"));
   GURL nested_url(embedded_test_server()->GetURL(
       "b.com", "/cross_site_iframe_factory.html?b()"));
   GURL nested_js_url(
       embedded_test_server()->GetURL("b.com", "/tree_parser_util.js"));
   url::Origin top_origin(top_url);
   url::Origin nested_origin(nested_url);
@@ skipping 25 matching lines @@
   EXPECT_EQ(top_origin, delegate_->data()[2]->initiator);
 
   // Cross-origin subresource requests have a unique first-party, and an
   // initiator that matches the document in which they're embedded.
   EXPECT_EQ(nested_js_url, delegate_->data()[3]->url);
   EXPECT_EQ(kURLWithUniqueOrigin, delegate_->data()[3]->first_party);
   EXPECT_EQ(nested_origin, delegate_->data()[3]->initiator);
 }
 
 }  // namespace content