[Context menu redesign] Fix null pointer exception

Bug: 987101
Change-Id: I46a33fcad060551b9f6216efab47147b0dfe8baf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716261Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Sinan Sahin <sinansahin@google.com>
Cr-Commit-Position: refs/heads/master@{#680604}

chrome/android/java/src/org/chromium/chrome/browser/contextmenu/RevampedContextMenuHeaderMediator.java

@@ -69,6 +69,12 @@ class RevampedContextMenuHeaderMediator implements View.OnClickListener {
         if (icon == null) {
             final RoundedIconGenerator iconGenerator = createRoundedIconGenerator(fallbackColor);
             icon = iconGenerator.generateIconForUrl(mPlainUrl);
+            // generateIconForUrl might return null if the URL is empty or the domain cannot be
+            // resolved. See https://crbug.com/987101
+            // TODO(sinansahin): Handle the case where generating an icon fails.
+            if (icon == null) {
+                return;
+            }
         }
 
         final int size = mContext.getResources().getDimensionPixelSize(