Remove redundant field initialization in Java code.

content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java

Index: content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java b/content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java
index 62ef0a00622c985abaa3cd3ffbae9cb19e28dc88..bec4df581dd348df7631b23d3a57e622c6c2f034 100644
--- a/content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java
+++ b/content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java
@@ -55,7 +55,7 @@ class PopupZoomer extends View {
         public boolean onLongPress(View v, MotionEvent event);
     }
 
-    private OnTapListener mOnTapListener = null;
+    private OnTapListener mOnTapListener;
 
     /**
      * Interface to be implemented to add and remove PopupZoomer to/from the view hierarchy.
@@ -65,7 +65,7 @@ class PopupZoomer extends View {
         public void onPopupZoomerHidden(PopupZoomer zoomer);
     }
 
-    private OnVisibilityChangedListener mOnVisibilityChangedListener = null;
+    private OnVisibilityChangedListener mOnVisibilityChangedListener;
 
     // Cached drawable used to frame the zooming popup.
     // TODO(tonyg): This should be marked purgeable so that if the system wants to recover this
@@ -80,14 +80,14 @@ class PopupZoomer extends View {
     private final Interpolator mShowInterpolator = new OvershootInterpolator();
     private final Interpolator mHideInterpolator = new ReverseInterpolator(mShowInterpolator);
 
-    private boolean mAnimating = false;
-    private boolean mShowing = false;
-    private long mAnimationStartTime = 0;
+    private boolean mAnimating;
+    private boolean mShowing;
+    private long mAnimationStartTime;
 
     // The time that was left for the outwards animation to finish.
     // This is used in the case that the zoomer is cancelled while it is still animating outwards,
     // to avoid having it jump to full size then animate closed.
-    private long mTimeLeft = 0;
+    private long mTimeLeft;
 
     // initDimensions() needs to be called in onDraw().
     private boolean mNeedsToInitDimensions;
@@ -103,7 +103,7 @@ class PopupZoomer extends View {
 
     // How far to shift the canvas after all zooming is done, to keep it inside the bounds of the
     // view (including margin).
-    private float mShiftX = 0, mShiftY = 0;
+    private float mShiftX, mShiftY;
     // The magnification factor of the popup. It is recomputed once we have mTargetBounds and
     // mZoomedBitmap.
     private float mScale = 1.0f;