Enable extension browser tests on debug windows.

chrome/browser/extensions/extension_apitest.cc

Index: chrome/browser/extensions/extension_apitest.cc
diff --git a/chrome/browser/extensions/extension_apitest.cc b/chrome/browser/extensions/extension_apitest.cc
index c2e313943bbb01f82b3fbecbf13d141a5d946d33..f4baf2a2a381873d45f5f306c6a48d3b6838850e 100644
--- a/chrome/browser/extensions/extension_apitest.cc
+++ b/chrome/browser/extensions/extension_apitest.cc
@@ -205,13 +205,7 @@ bool ExtensionApiTest::RunExtensionTestIncognitoNoFileAccess(
 }
 
 bool ExtensionApiTest::ExtensionSubtestsAreSkipped() {
-  // See http://crbug.com/177163 for details.
-#if defined(OS_WIN) && !defined(NDEBUG)
-  LOG(WARNING) << "Workaround for 177163, prematurely returning";
-  return true;
-#else
   return false;
-#endif
 }
 
 bool ExtensionApiTest::RunExtensionSubtest(const std::string& extension_name,