Fix inconsistent and incorrect Roboto Medium usage

chrome/android/java/res/layout/fre_data_reduction_proxy.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.firstrun.FirstRunView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:chrome="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
@@ skipping 48 matching lines @@
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
                         android:layout_marginBottom="@dimen/fre_vertical_spacing"
                         android:gravity="start"
                         android:lineSpacingMultiplier="1.4"
                         android:text="@string/data_reduction_promo_summary"
                         android:textColor="@color/fre_text_color"
                         android:textSize="@dimen/fre_normal_text_size" />
 
                     <android.support.v7.widget.SwitchCompat
+                        style="@style/RobotoMediumStyle"
                         android:id="@+id/enable_data_saver_switch"
                         android:layout_width="match_parent"
                         android:layout_height="wrap_content"
                         android:lineSpacingMultiplier="1.4"
                         android:showText="false"
                         android:text="@string/data_reduction_enabled_switch"
                         android:textColor="@color/fre_text_color"
-                        android:textSize="@dimen/fre_normal_text_size"
-                        android:fontFamily="sans-serif-medium" />
+                        android:textSize="@dimen/fre_normal_text_size" />
                     
                 </LinearLayout>
             </LinearLayout>
         </LinearLayout>
     </ScrollView>
 
     <!-- fre_button_bar_height = 52dp = layout_height + layout_marginBottom -->
     <org.chromium.ui.widget.ButtonCompat
         android:id="@+id/next_button"
         android:layout_width="wrap_content"
         android:layout_height="36dp"
         android:layout_marginBottom="16dp"
         android:layout_gravity="bottom|center_horizontal"
         android:paddingStart="@dimen/fre_button_padding"
         android:paddingEnd="@dimen/fre_button_padding"
         android:text="@string/next"
         android:textAllCaps="true"
         android:textColor="@android:color/white"
         android:textSize="@dimen/fre_button_text_size"
         chrome:buttonColor="@color/light_active_color"
         chrome:buttonRaised="false"/>
 </org.chromium.chrome.browser.firstrun.FirstRunView>