Revert of Enable extension browser tests on debug windows. (patchset #1 id:1...

Revert of Enable extension browser tests on debug windows. (patchset #1 id:1 of https://codereview.chromium.org/1128253005/)

Reason for revert:
 GcdPrivateAPITest.WifiPasswords fails after this patch.

Failure example:
http://build.chromium.org/p/chromium.win/buildstatus?builder=Win7%20Tests%20%28dbg%29%281%29&number=37938

Original issue's description:
> Enable extension browser tests on debug windows.
>
> BUG=177163
>
> Committed: https://crrev.com/121cbb5f7fce9719ab6152cb2e059575df8139d6
> Cr-Commit-Position: refs/heads/master@{#329495}

TBR=asargent@chromium.org,hubbe@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=177163

Review URL: https://codereview.chromium.org/1134333003

Cr-Commit-Position: refs/heads/master@{#329622}

chrome/browser/extensions/extension_apitest.cc

@@ -205,7 +205,13 @@ 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,