[ImportantStorage] Clear button string update and lint fixes.

chrome/android/java/res/layout/manage_space_activity.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. -->
 
 <ScrollView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/main_scroll_view"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
     <LinearLayout
         android:id="@+id/main_view"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="wrap_content"
         android:layout_marginStart="16dp"
         android:layout_marginEnd="16dp"
         android:orientation="vertical"
         android:paddingStart="6dp"
         android:paddingEnd="6dp"
         android:paddingTop="5dp"
         android:paddingBottom="5dp">
 
         <!-- ======== 'Unimportant Storage' Info ======== -->
         <TextView
             android:id="@+id/unimportant_site_data_description"
             android:text="@string/storage_management_unimportant_site_data_description"
             style="@style/ManageSpaceActivityExplanationTextView" />
 
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:baselineAligned="true"
             android:orientation="horizontal">
 
             <TextView
                 android:id="@+id/unimportant_site_data_size_prefix"
                 android:text="@string/storage_management_unimportant_site_data_size_label"
                 android:layout_weight="1"
+                android:layout_width="0dp"
                 style="@style/ManageSpaceActivitySizeTextView" />
 
             <TextView
                 android:id="@+id/unimportant_site_data_storage_size_text"
                 style="@style/ManageSpaceActivitySizeTextView" />
         </LinearLayout>
 
         <Button
             android:id="@+id/clear_unimportant_site_data_storage"
             android:text="@string/storage_management_clear_unimportant_site_data_button"
             style="@style/ManageSpaceActivityButton" />
 
 
         <!-- ======== Site Storage Info ======== -->
         <TextView
             android:id="@+id/site_data_description"
             android:text="@string/storage_management_site_data_description"
             style="@style/ManageSpaceActivityExplanationTextView" />
 
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:baselineAligned="true"
             android:orientation="horizontal">
 
             <TextView
                 android:id="@+id/site_data_size_prefix"
                 android:text="@string/storage_management_site_data_size_label"
                 android:layout_weight="1"
+                android:layout_width="0dp"
                 style="@style/ManageSpaceActivitySizeTextView" />
 
             <TextView
                 android:id="@+id/site_data_storage_size_text"
                 style="@style/ManageSpaceActivitySizeTextView" />
         </LinearLayout>
 
         <Button
             android:id="@+id/manage_site_data_storage"
             android:text="@string/storage_management_manage_site_data_button"
             style="@style/ManageSpaceActivityButton" />
 
         <!-- ======== Global storage info ======== -->
 
         <TextView
             android:id="@+id/all_storage_description"
             android:text="@string/storage_management_all_storage_description"
             android:paddingTop="12dp"
             style="@style/ManageSpaceActivityExplanationTextView" />
 
         <Button
             android:id="@+id/clear_all_data"
             android:text="@string/storage_management_clear_all_data_button"
                 style="@style/ManageSpaceActivityButton" />
     </LinearLayout>
 </ScrollView>