Fix inconsistent and incorrect Roboto Medium usage

chrome/android/java/res/values/values.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2011 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. -->
 
 <resources
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     tools:ignore="MissingTranslation">
 
-    <!-- Font to use when a spec asks for "Roboto Medium".
-         Bolding the text makes it look almost, but not quite, entirely unlike Roboto Medium,
-         which doesn't exist pre-L. -->
-    <string name="roboto_medium_typeface">sans-serif</string>
-    <integer name="roboto_medium_textstyle">1</integer>
-
     <!-- Menu Animation Constants -->
     <item type="fraction" format="fraction" name="menu_animation_pivot_x">95%</item>
 
     <!-- Full Screen Constants -->
     <!-- These constants were chosen empirically for their visually pleasant behavior.
          Contact tedchoc@chromium.org or dtrainor@chromium.org for questions about
          changing these values. -->
     <item name="top_controls_show_threshold" format="float" type="dimen">0.5</item>
     <item name="top_controls_hide_threshold" format="float" type="dimen">0.5</item>
 
@@ skipping 40 matching lines @@
     <string name="help_context_suggestions">mobile_content_suggestions</string>
 
     <!-- Our manage space activity. Default pre-KitKat to be nothing. -->
     <string name="manage_space_activity"></string>
 
     <!-- Whether the device is a tablet or large tablet. Used to determine which resources the OS
          loaded. -->
     <bool name="is_tablet">false</bool>
     <bool name="is_large_tablet">false</bool>
 </resources>