Remove work around for AppCompat switch thumb issues

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

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/ChromeSwitchCompat.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/ChromeSwitchCompat.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/ChromeSwitchCompat.java
index 7466ff988c03784bf3e9c4ea3dd8242ebded4d4d..fe6526b7b71aa5014a6ef3043398018f04b4a295 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/widget/ChromeSwitchCompat.java
+++ b/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;
-    }
 }