Check for warnings when loading extensions in browser tests.

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

-<script>
-var URL = chrome.extension.getURL("getFrame/a.html");
-var tabId = -1;
-var processId = -1;
-
-chrome.test.runTests([
-  function testGetFrame() {
-    chrome.tabs.create({"url": "about:blank"}, function(tab) {
-      tabId = tab.id;
-      var done = chrome.test.listenForever(
-        chrome.webNavigation.onCommitted,
-        function (details) {
-          if (details.tabId != tabId)
-            return;
-          if (details.url != URL)
-            return;
-          processId = details.processId;
-          chrome.webNavigation.getFrame(
-              {tabId: tabId, frameId: 0, processId: processId},
-              function(details) {
-            chrome.test.assertEq({errorOccurred: false, url: URL},
-                                 details);
-            done();
-          });
-      });
-      chrome.tabs.update(tabId, {url: URL});
-    });
-  },
-
-  function testGetInvalidFrame() {
-    chrome.webNavigation.getFrame(
-        {tabId: tabId, frameId: 1, processId: processId},
-      function (details) {
-        chrome.test.assertEq(null, details);
-        chrome.test.succeed();
-    });
-  },
-
-  function testGetAllFrames() {
-    chrome.webNavigation.getAllFrames(
-        {tabId: tabId},
-      function (details) {
-        chrome.test.assertEq(
-            [{errorOccurred: false,
-              frameId: 0,
-              processId: processId,
-              url: URL}],
-             details);
-        chrome.test.succeed();
-    });
-  }
-]);
-</script>
+<script src="test_getFrame.js"></script>