[ImportantStorage] Clear button string update and lint fixes.

chrome/android/java/res/layout/confirm_important_sites_list_row.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"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="horizontal"
     android:minHeight="?attr/listPreferredItemHeightSmall"
     android:paddingStart="19dp"
     android:paddingEnd="19dp">
 
     <CheckBox
         android:id="@+id/icon_row_checkbox"
         android:clickable="false"
         android:focusable="false"
         android:focusableInTouchMode="false"
         android:layout_width="0dp"
         android:layout_weight="1"
         android:layout_height="match_parent"
         android:gravity="center_vertical"
         android:ellipsize="end"
         android:textSize="14sp"
         android:padding="2dp"/>
     <ImageView

[Theresa, 2016/06/27 20:11:17]

Can the image view gain focus when TalkBack is on?

[dmurph, 2016/06/27 21:28:44]

Fixed by disabling accessibility.

         android:id="@+id/icon_row_image"
+        android:contentDescription="@null"
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
         android:gravity="center_vertical"
         android:scaleType="center"
         android:padding="2dp" />
 </LinearLayout>