Increase the delay in WebNavigationEvents test from 500ms to 1s.

chrome/test/data/extensions/api_test/webnavigation/navigation/test.html

 <script>
 var expectedEventData;
 var capturedEventData;
 
 function expect(data) {
   expectedEventData = data;
   capturedEventData = [];
 }
 
 function checkExpectations() {
@@ skipping 27 matching lines @@
             { frameId: 0,
               tabId: tabId,
               timeStamp: 0,
               transitionQualifiers: "",
               transitionType: "link",
               url: getURL('simpleLoad/a.html') }]);
           chrome.tabs.update(tabId, { url: getURL('simpleLoad/a.html') });
         },
 
         /* Navigates to a.html that redirects to b.html (using javascript)
-           after a delay of 500ms, so the initial navigation is completed and
+           after a delay of 1s, so the initial navigation is completed and
            the redirection is marked as client_redirect */
         function clientRedirect() {
           expect([
             { frameId: 0,
               tabId: tabId,
               timeStamp: 0,
               transitionQualifiers: "",
               transitionType: "link",
               url: getURL('clientRedirect/a.html') },
             { frameId: 0,
@@ skipping 45 matching lines @@
               tabId: tabId,
               timeStamp: 0,
               transitionQualifiers: "",
               transitionType: "link",
               url: getURL('iframe/a.html') }]);
           chrome.tabs.update(tabId, { url: getURL('iframe/a.html') });
         },
     ]);
 });
 </script>