Fix logic error in web_view_browsertest.

BUG=None
TEST=browser_tests --gtest_filter=WebViewTest.*Visib*

Review URL: https://codereview.chromium.org/292923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271829 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/apps/web_view_browsertest.cc

@@ -130,7 +130,7 @@ class WebContentsHiddenObserver : public content::WebContentsObserver {
                             const base::Closure& hidden_callback)
       : WebContentsObserver(web_contents),
         hidden_callback_(hidden_callback),
-        hidden_observed_(true) {
+        hidden_observed_(false) {
   }
 
   // WebContentsObserver.