Fix inconsistent and incorrect Roboto Medium usage

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 99 matching lines @@
                         android:layout_marginBottom="16dp"
                         android:textColor="@color/descriptive_text_color"
                         android:textSize="@dimen/fre_normal_text_size"
                         android:ellipsize="end"
                         android:maxLines="1"/>
                 </LinearLayout>
 
                 <View style="@style/Divider"/>
 
                 <TextView
+                    style="@style/RobotoMediumStyle"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:layout_marginTop="16dp"
                     android:layout_marginBottom="8dp"
                     android:paddingStart="16dp"
                     android:paddingEnd="16dp"
                     android:text="@string/sync_confirmation_chrome_sync_title"
                     android:textColor="@color/default_text_color"
                     android:textSize="@dimen/fre_normal_text_size"
-                    android:fontFamily="sans-serif-medium"
                     android:drawableStart="@drawable/chrome_sync_logo"
                     android:drawablePadding="16dp"/>
 
                 <TextView
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:layout_marginBottom="16dp"
                     android:paddingStart="56dp"
                     android:paddingEnd="16dp"
                     android:lineSpacingMultiplier="1.4"
                     android:text="@string/sync_confirmation_chrome_sync_message"
                     android:textColor="@color/descriptive_text_color"
                     android:textSize="@dimen/fre_normal_text_size" />
 
                 <View
                     style="@style/Divider"
                     android:layout_marginStart="56dp"
                     android:layout_marginEnd="16dp"/>
 
                 <TextView
+                    style="@style/RobotoMediumStyle"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:layout_marginTop="16dp"
                     android:layout_marginBottom="8dp"
                     android:paddingStart="16dp"
                     android:paddingEnd="16dp"
                     android:text="@string/sync_confirmation_personalize_services_title"
                     android:textColor="@color/default_text_color"
                     android:textSize="@dimen/fre_normal_text_size"
-                    android:fontFamily="sans-serif-medium"
                     android:drawableStart="@drawable/googleg"
                     android:drawablePadding="16dp"/>
 
                 <TextView
                     android:id="@+id/signin_personalize_service_description"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:layout_marginBottom="32dp"
                     android:paddingStart="56dp"
                     android:paddingEnd="16dp"
@@ skipping 74 matching lines @@
 
         <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>