Remove work around for AppCompat switch thumb issues

Original work around done in: crbug.com/455327 and crbug.com/459782

BUG=440601

Review URL: https://codereview.chromium.org/1019593002

Cr-Commit-Position: refs/heads/master@{#321385}

chrome/android/java/res/color/switch_thumb_tint.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. -->
-
-<!--  TODO(twellington): remove after support library is rolled to pick up their fix for
-                         the thumb drawable not always being visible (crbug.com/440601).  -->
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:state_enabled="true" android:state_checked="true"
-          android:color="@color/pref_accent_color" />
-    <item android:state_enabled="true" android:state_checked="false"
-          android:color="#ececec" />
-    <item android:color="#b9b9b9" />
-</selector>
\ No newline at end of file

chrome/android/java/res/drawable/switch_thumb.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.
--->
-
-<!--  TODO(twellington): remove after support library is rolled to pick up their fix for
-                         the thumb drawable not always being visible (crbug.com/440601).  -->
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:state_checked="true" android:drawable="@drawable/btn_switch_to_on_mtrl_00012" />
-    <item android:drawable="@drawable/btn_switch_to_on_mtrl_00001" />
-</selector>
\ No newline at end of file

chrome/android/java/src/org/chromium/chrome/browser/widget/ChromeSwitchCompat.java

@@ -5,17 +5,12 @@
 package org.chromium.chrome.browser.widget;
 
 import android.content.Context;
-import android.content.res.ColorStateList;
-import android.graphics.PorterDuff;
-import android.graphics.drawable.Drawable;
 import android.support.v7.widget.SwitchCompat;
 import android.util.AttributeSet;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.Switch;
 
-import org.chromium.chrome.R;
-
 /**
  * This class fixes the accessibility of SwitchCompat so it's read as "on switch" instead of
  * "checkbox checked". http://crbug.com/441702
@@ -24,24 +19,15 @@ import org.chromium.chrome.R;
  * "Checkbox". This works around the bug by marking accessibility events from SwitchCompat with the
  * Switch class name, which TalkBack recognizes.
  *
- * It also fixes the thumb drawable being too small and disappearing on certain devices
- * and the disabled tint color being incorrect. http://crbug.com/455327
- *
  * TODO(newt): Delete this class once the support library is fixed. http://b/19110477
  */
 public class ChromeSwitchCompat extends SwitchCompat {
-    private Drawable mThumbDrawable;
-    private ColorStateList mTint;
 
     /**
      * Constructor for inflating from XML.
      */
     public ChromeSwitchCompat(Context context, AttributeSet attrs) {
         super(context, attrs);
-        setThumbResource(R.drawable.switch_thumb);
-        mThumbDrawable = getThumbDrawable();
-        mThumbDrawable.mutate();
-        mTint = getResources().getColorStateList(R.color.switch_thumb_tint);
     }
 
     @Override
@@ -55,17 +41,4 @@ public class ChromeSwitchCompat extends SwitchCompat {
         super.onInitializeAccessibilityNodeInfo(info);
         info.setClassName(Switch.class.getName());
     }
-
-    @Override
-    protected void drawableStateChanged() {
-        super.drawableStateChanged();
-        updateThumbTintColor();
-    }
-
-    private boolean updateThumbTintColor() {
-        if (mTint == null) return false;
-        mThumbDrawable.setColorFilter(mTint.getColorForState(mThumbDrawable.getState(), 0),
-                PorterDuff.Mode.SRC_IN);
-        return true;
-    }
 }