Update a host_resolver()->AddRule in chrome/browser that I missed earlier.

Part 3/2.

BUG=713847

Review-Url: https://codereview.chromium.org/2856593002
Cr-Commit-Position: refs/heads/master@{#468432}

chrome/browser/extensions/process_manager_browsertest.cc

@@ -181,6 +181,12 @@ class ProcessManagerBrowserTest : public ExtensionBrowserTest {
   ProcessManagerBrowserTest() {
     guest_view::GuestViewManager::set_factory_for_testing(&factory_);
   }
+
+  void SetUpOnMainThread() override {
+    ExtensionBrowserTest::SetUpOnMainThread();
+    host_resolver()->AddRule("*", "127.0.0.1");
+  }
+
   // Create an extension with web-accessible frames and an optional background
   // page.
   const Extension* CreateExtension(const std::string& name,
@@ -424,7 +430,6 @@ IN_PROC_BROWSER_TEST_F(ProcessManagerBrowserTest, HttpHostMatchingExtensionId) {
   // Set up a test server running at http://[extension-id]
   ASSERT_TRUE(extension.get());
   const std::string& aliased_host = extension->id();
-  host_resolver()->AddRule(aliased_host, "127.0.0.1");
   ASSERT_TRUE(embedded_test_server()->Start());
   GURL url =
       embedded_test_server()->GetURL("/extensions/test_file_with_body.html");
@@ -1229,8 +1234,6 @@ IN_PROC_BROWSER_TEST_F(ProcessManagerBrowserTest,
   if (content::AreAllSitesIsolatedForTesting())
     return;
 
-  host_resolver()->AddRule("*", "127.0.0.1");
-
   // Create a simple extension without a background page.
   const Extension* extension = CreateExtension("Extension", false);
   embedded_test_server()->ServeFilesFromDirectory(extension->path());