DevTools: fix extension parameters passing.

Review URL: http://codereview.chromium.org/6824035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81094 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_debugger_api.cc b/chrome/browser/extensions/extension_debugger_api.cc
index 5b15134c..c65687a 100644
--- a/chrome/browser/extensions/extension_debugger_api.cc
+++ b/chrome/browser/extensions/extension_debugger_api.cc
@@ -336,7 +336,7 @@
   EXTENSION_FUNCTION_VALIDATE(args_->GetString(1, &method));
 
   Value *params;
-  if (args_->Get(2, &params))
+  if (!args_->Get(2, &params))
     params = NULL;
 
   client_host_->SendMessageToBackend(this, method, params);