Removed old workaround for button padding from AccountSigninView

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 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.
 -->
 <org.chromium.chrome.browser.signin.AccountSigninView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:chrome="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
@@ skipping 207 matching lines @@
         android:paddingStart="16dp"
         android:paddingEnd="16dp"
         android:orientation="horizontal" >
 
         <!--suppress ButtonStyle -->
         <Button
             android:id="@+id/negative_button"
             style="@style/ButtonCompatBorderless"
             android:layout_width="wrap_content"
             android:layout_height="36dp"
+            android:paddingStart="@dimen/fre_button_padding"
+            android:paddingEnd="@dimen/fre_button_padding"
             android:text="@string/fre_skip_text"
             android:textAllCaps="true"
             android:textColor="@color/light_active_color"
             android:textSize="14sp"/>
 
         <View
             android:layout_width="0dp"
             android:layout_height="0dp"
             android:layout_weight="1"
             android:visibility="invisible"/>
 
         <FrameLayout
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:measureAllChildren="true">
 
             <!--suppress ButtonStyle -->
             <org.chromium.ui.widget.ButtonCompat
                 android:id="@+id/positive_button"
                 android:layout_width="wrap_content"
                 android:layout_height="36dp"
+                android:paddingStart="@dimen/fre_button_padding"
+                android:paddingEnd="@dimen/fre_button_padding"
                 android:text="@string/choose_account_sign_in"
                 android:textAllCaps="true"
                 android:textColor="@android:color/white"
                 android:textSize="14sp"
                 chrome:buttonColor="@color/light_active_color"
                 chrome:buttonRaised="false"/>
 
             <Button
                 android:id="@+id/more_button"
                 style="@style/ButtonCompatBorderless"
                 android:layout_width="wrap_content"
                 android:layout_height="36dp"
                 android:text="@string/more"
                 android:textAllCaps="true"
                 android:textColor="@color/light_active_color"
                 android:textSize="14sp"
                 android:drawableEnd="@drawable/down_arrow"
                 android:drawablePadding="8dp"
                 android:visibility="gone"/>
-            </FrameLayout>
+        </FrameLayout>
 
         <View
             android:id="@+id/positive_button_end_padding"
             android:layout_width="0dp"
             android:layout_height="0dp"
             android:layout_weight="1"
             android:visibility="gone"/>
     </LinearLayout>
 
 </org.chromium.chrome.browser.signin.AccountSigninView>