Fix random lint warnings in chrome/android/shell

chrome/android/shell/res/layout/suggestion_item.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 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"
     android:id="@+id/suggestion_item"
     android:layout_width="wrap_content"
     android:layout_height="match_parent"
     android:gravity="center_vertical"
     android:orientation="horizontal">
 
-    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    <LinearLayout
         android:id="@+id/inner_layout"
         android:layout_width="0dp"
         android:layout_height="match_parent"
         android:layout_weight="1"
         android:orientation="vertical"
         android:layout_gravity="center_vertical">
 
         <TextView android:id="@+id/suggestion_item_label"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginStart="10dp"
             android:layout_marginEnd="10dp"
             android:ellipsize="end"
             android:singleLine="true"
             android:textAlignment="viewStart"
+            android:gravity="start"
             android:textSize="18sp"
             android:includeFontPadding="false"/>
 
         <TextView android:id="@+id/suggestion_item_sublabel"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginStart="10dp"
             android:layout_marginEnd="10dp"
             android:textSize="14sp"
             android:textColor="#8b8b8b"
             android:ellipsize="end"
             android:singleLine="true"
             android:textAlignment="viewStart"
+            android:gravity="start"
             android:includeFontPadding="false"/>
     </LinearLayout>
 
     <ImageView
         android:background="?android:attr/selectableItemBackground"
         android:id="@+id/suggestion_item_arrow"
         android:layout_width="50dp"
         android:layout_height="match_parent"
         android:gravity="end"
         android:scaleType="center"
-        android:src="@drawable/suggestion_arrow"/>
+        android:src="@drawable/suggestion_arrow"
+        android:contentDescription="@null" />
 </LinearLayout>