[Android] Width constrain bookmarks and downloads UIs

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2016 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <LinearLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:chrome="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:paddingStart="@dimen/downloads_item_margin"
-        android:paddingEnd="14dp"
-        android:paddingTop="26dp"
+        android:paddingTop="16dp"
         android:paddingBottom="6dp"
         android:orientation="vertical" >
 
     <TextView
             android:id="@+id/size_downloaded"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:singleLine="true"
             android:textColor="@color/google_blue_500"
             android:textSize="16sp"
@@ skipping 20 matching lines @@
 
     <TextView
             android:id="@+id/size_free"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:singleLine="true"
             android:textColor="@color/black_alpha_54"
             android:textSize="14sp" />
 
 </LinearLayout>