Update references to the extension messaging APIs to point to the "runtime"

chrome/test/data/extensions/api_test/page_capture/test.js

Index: chrome/test/data/extensions/api_test/page_capture/test.js
diff --git a/chrome/test/data/extensions/api_test/page_capture/test.js b/chrome/test/data/extensions/api_test/page_capture/test.js
index dec134278771b6f3257b62235c516c1c1746d480..205530a0af51bbdacc98cefae41081e0133acaa8 100644
--- a/chrome/test/data/extensions/api_test/page_capture/test.js
+++ b/chrome/test/data/extensions/api_test/page_capture/test.js
@@ -31,7 +31,7 @@ chrome.test.getConfig(function(config) {
         waitForCurrentTabLoaded(function() {
           chrome.pageCapture.saveAsMHTML({ "tabId": tab.id },
               function(data) {
-            assertEq(undefined, chrome.extension.lastError);
+            assertEq(undefined, chrome.runtime.lastError);
             assertTrue(data != null);
             // It should contain few KBs of data.
             assertTrue(data.size > 100);