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

content/browser/accessibility/accessibility_win_browsertest.cc

Index: content/browser/accessibility/accessibility_win_browsertest.cc
diff --git a/content/browser/accessibility/accessibility_win_browsertest.cc b/content/browser/accessibility/accessibility_win_browsertest.cc
index 7ca9e9ff3678c094c70f84af6a5bf22b02d381a4..4b6f4d735e8d4441a76289a95b5a4a7d21d363f7 100644
--- a/content/browser/accessibility/accessibility_win_browsertest.cc
+++ b/content/browser/accessibility/accessibility_win_browsertest.cc
@@ -1915,7 +1915,6 @@ IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest, HasHWNDAfterNavigation) {
   // is not called again after its window is added to the root window.
   // Ensure that we still get a legacy HWND for accessibility.
 
-  host_resolver()->AddRule("*", "127.0.0.1");
   ASSERT_TRUE(embedded_test_server()->Start());
   WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
       shell()->web_contents());
@@ -1950,7 +1949,6 @@ IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest, HasHWNDAfterNavigation) {
 }
 
 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest, TestAccNavigateInTables) {
-  host_resolver()->AddRule("*", "127.0.0.1");
   ASSERT_TRUE(embedded_test_server()->Start());
   AccessibilityNotificationWaiter waiter(shell()->web_contents(),
                                          kAccessibilityModeComplete,