Fix import statements in android.widget package.

Additionally this CL removes spaces at the end of the line.

Test: code still compiles.
Change-Id: I1ce98b4e70aa3ae614f87966c3bc6181fa4389a4
diff --git a/core/java/android/widget/CompoundButton.java b/core/java/android/widget/CompoundButton.java
index 0357834..dd63fef 100644
--- a/core/java/android/widget/CompoundButton.java
+++ b/core/java/android/widget/CompoundButton.java
@@ -19,14 +19,11 @@
 import android.annotation.DrawableRes;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
-import android.graphics.PorterDuff;
-import android.view.ViewHierarchyEncoder;
-import com.android.internal.R;
-
 import android.content.Context;
 import android.content.res.ColorStateList;
 import android.content.res.TypedArray;
 import android.graphics.Canvas;
+import android.graphics.PorterDuff;
 import android.graphics.drawable.Drawable;
 import android.os.Parcel;
 import android.os.Parcelable;
@@ -34,9 +31,12 @@
 import android.view.Gravity;
 import android.view.SoundEffectConstants;
 import android.view.ViewDebug;
+import android.view.ViewHierarchyEncoder;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 
+import com.android.internal.R;
+
 /**
  * <p>
  * A button with two states, checked and unchecked. When the button is pressed
@@ -159,7 +159,7 @@
                 mOnCheckedChangeWidgetListener.onCheckedChanged(this, mChecked);
             }
 
-            mBroadcasting = false;            
+            mBroadcasting = false;
         }
     }
 
@@ -492,7 +492,7 @@
         SavedState(Parcelable superState) {
             super(superState);
         }
-        
+
         /**
          * Constructor called from {@link #CREATOR}
          */