Fix preferences typo in offline indicator controller.

Bug: 880486
Change-Id: Ia10f8917c02adff50747ad722a8d8a2174edbba2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422325Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Chunbo Hua <chunbo.hua@intel.com>
Cr-Commit-Position: refs/heads/master@{#809331}

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/indicator/OfflineIndicatorController.java

@@ -241,7 +241,7 @@ public class OfflineIndicatorController implements ConnectivityDetector.Observer
         // If this is the first time to show offline indicator, show it. Otherwise, it will only
         // be shown if the user has been continuously online for the required duration, then goes
         // back to being offline.
-        // TODO(jianli): keep these values in shared prefernces. (http://crbug.com/879725)
+        // TODO(jianli): keep these values in shared preferences. (http://crbug.com/879725)
         if (mHasOfflineIndicatorShownSinceActivityResumed && !mWasOnlineForRequiredDuration) {
             return;
         }