Remove superfluous int cast

I get a warning about the cast, turns out the cast is not
needed since round will return int:
https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#round-float-

Bug: None
Signed-off-by: Rob Buis <rob.buis@samsung.com>
Change-Id: I677f09c0a7a731d6bc788618cefb1e1b5c2da5c6
Reviewed-on: https://chromium-review.googlesource.com/592239Reviewed-by: Jeffrey Yasskin <jyasskin@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491114}

chrome/android/java/src/org/chromium/chrome/browser/ItemChooserDialog.java

@@ -520,7 +520,7 @@ public class ItemChooserDialog {
         // Round to (an integer + 0.5) times LIST_ROW_HEIGHT.
         heightDp = (Math.round(heightDp / LIST_ROW_HEIGHT_DP - 0.5f) + 0.5f) * LIST_ROW_HEIGHT_DP;
         heightDp = MathUtils.clamp(heightDp, MIN_HEIGHT_DP, MAX_HEIGHT_DP);
-        return (int) Math.round(heightDp * density);
+        return Math.round(heightDp * density);
     }
 
     private void showDialogForView(View view) {