Reduce infobar lag on KitKat from 1000ms to 100ms.

chrome/android/java/res/layout/infobar_wrapper.xml

Index: chrome/android/java/res/layout/infobar_wrapper.xml
diff --git a/chrome/android/java/res/layout/infobar_wrapper.xml b/chrome/android/java/res/layout/infobar_wrapper.xml
index 21b226470060d3afa1fd45528d45d8e2cf3785b6..86ee21e429690743e41cb76ad1e287693ea80d3b 100644
--- a/chrome/android/java/res/layout/infobar_wrapper.xml
+++ b/chrome/android/java/res/layout/infobar_wrapper.xml
@@ -3,13 +3,9 @@
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
-<!-- Use RelativeLayout because it has a gravity attribute, unlike FrameLayout.
-     During infobar swap animations, two child views are added to this infobar
-     wrapper, and gravity="top" ensures they're both aligned at the top. -->
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:background="@drawable/infobar_bg"
-    android:gravity="top"
     android:minHeight="@dimen/infobar_peeking_height_with_shadow"
     android:paddingTop="@dimen/infobar_shadow_height" />