Delete dead code

Bug: 22378829

Every time setText is called a BoringLayout is created.
BoringLayout internally creates a new Paint called mWorkPaint.

However, creating a Paint turns out to be somewhat substantial
amount of work, and mWorkPaint is never actually used. Deleting
this shaves off roughly 50ms and 1,000 object creations during
a fling on a listview.

Change-Id: I5d03402b9027df6ce0f3e58160752c66c69a4d2d

core/java/android/text/Layout.java

@@ -206,7 +206,6 @@ public abstract class Layout {
 
         mText = text;
         mPaint = paint;
-        mWorkPaint = new TextPaint();
         mWidth = width;
         mAlignment = align;
         mSpacingMult = spacingMult;
@@ -1993,7 +1992,6 @@ public abstract class Layout {
 
     private CharSequence mText;
     private TextPaint mPaint;
-    /* package */ TextPaint mWorkPaint;
     private int mWidth;
     private Alignment mAlignment = Alignment.ALIGN_NORMAL;
     private float mSpacingMult;