Prevent making real DNS lookups by chrome tests.

chrome/browser/extensions/extension_view_unittest.cc

Index: chrome/browser/extensions/extension_view_unittest.cc
diff --git a/chrome/browser/extensions/extension_view_unittest.cc b/chrome/browser/extensions/extension_view_unittest.cc
index bc17d4cda4c4cf43785b3211c86d70548d5f81a2..3eb614f3c4f5c50b87fd969b99ac91f01f058ba9 100755
--- a/chrome/browser/extensions/extension_view_unittest.cc
+++ b/chrome/browser/extensions/extension_view_unittest.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/message_loop.h"
+#include "base/ref_counted.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/profile.h"
@@ -13,6 +14,7 @@
 #include "chrome/common/notification_service.h"
 #include "chrome/test/in_process_browser_test.h"
 #include "chrome/test/ui_test_utils.h"
+#include "net/base/host_resolver_unittest.h"
 
 namespace {
 
@@ -99,6 +101,14 @@ class ExtensionLoadedObserver : public NotificationObserver {
 
 class ExtensionViewTest : public InProcessBrowserTest {
  public:
+  ExtensionViewTest() {
+    host_mapper_ = new net::RuleBasedHostMapper();
+    // TODO(aa): Don't make a real dns lookup here or simulate a failing lookup.
+    // But if it's really needed then remove the TODO.
+    host_mapper_->AllowDirectLookup("*.google.com");
+    scoped_host_mapper_.Init(host_mapper_.get());
+  }
+
   virtual void SetUp() {
     // Initialize the error reporter here, otherwise BrowserMain will create it
     // with the wrong MessageLoop.
@@ -109,6 +119,10 @@ class ExtensionViewTest : public InProcessBrowserTest {
 
     InProcessBrowserTest::SetUp();
   }
+
+ private:
+  scoped_refptr<net::RuleBasedHostMapper> host_mapper_;
+  net::ScopedHostMapper scoped_host_mapper_;
 };
 
 // Tests that ExtensionView starts an extension process and runs the script