Fix typo in ExtensionHost

A backwards conditional could, in theory, result in dev tools not being able
to attach to extension background pages. I cannot reproduce a problem with
this but the code is clearly wrong.

BUG=none
TEST=none (QA - nothing to do here)

Review URL: https://codereview.chromium.org/191173002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255852 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/extension_host.cc

@@ -195,7 +195,7 @@ void ExtensionHost::CreateRenderViewSoon() {
 
 void ExtensionHost::CreateRenderViewNow() {
   LoadInitialURL();
-  if (!IsBackgroundPage()) {
+  if (IsBackgroundPage()) {
     DCHECK(IsRenderViewLive());
     ExtensionsBrowserClient::Get()->OnRenderViewCreatedForBackgroundPage(this);
   }