[Android History] Even more polish

chrome/android/java/res/layout/history_header.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="vertical"
     android:layout_marginBottom="8dp" >
 
     <LinearLayout
+        android:id="@+id/privacy_disclaimers"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical"
-        android:layout_marginTop="8dp" >
+        android:layout_marginTop="8dp"
+        android:layout_marginBottom="12dp" >
 
         <org.chromium.ui.widget.TextViewWithClickableSpans
             android:id="@+id/signed_in_not_synced"
             style="@style/PrivacyDisclaimerText" />
 
        <org.chromium.ui.widget.TextViewWithClickableSpans
             android:id="@+id/signed_in_synced"
             style="@style/PrivacyDisclaimerText" />
 
        <org.chromium.ui.widget.TextViewWithClickableSpans
             android:id="@+id/other_forms_of_browsing_history"
             style="@style/PrivacyDisclaimerText" />
 
     </LinearLayout>
 
     <FrameLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_marginTop="16dp"
+        android:layout_marginTop="4dp"
         android:background="@drawable/list_item_single" >
 
+        <!-- TODO(twellington): change start/end padding back to 16dp
+                                when new assets with correct built in padding
+                                are available. -->
         <Button
             android:id="@+id/clear_browsing_data_button"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             style="@style/ButtonCompatBorderless"
             android:paddingTop="16dp"
             android:paddingBottom="16dp"
-            android:paddingStart="16dp"
-            android:paddingEnd="16dp"
+            android:paddingStart="17dp"
+            android:paddingEnd="17dp"
             android:gravity="center_vertical|start"
             android:text="@string/open_clear_browsing_data_dialog_button"
             android:textAllCaps="true"
             android:textColor="@color/history_cbd_button_tint"
             android:textSize="14sp" />
 
     </FrameLayout>
 </LinearLayout>