Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/OverlayPanelBase.java

 // Copyright 2016 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.
 
 package org.chromium.chrome.browser.compositor.bottombar;
 
 import android.content.Context;
 import android.graphics.Color;
 import android.view.ViewGroup;
 
@@ skipping 91 matching lines @@
     /** The height of the Bar when the Panel is maximized, in dps. */
     private final float mBarHeightMaximized;
 
     /** Ratio of dps per pixel. */
     protected final float mPxToDp;
 
     /**
      * The Y coordinate to apply to the Base Page in order to keep the selection
      * in view when the Overlay Panel is in its EXPANDED state.
      */
-    private float mBasePageTargetY = 0.f;
+    private float mBasePageTargetY;
 
     /** The current context. */
     protected final Context mContext;
 
     /** The current state of the Overlay Panel. */
     private PanelState mPanelState = PanelState.UNDEFINED;
 
     /**
      * Valid previous states for the Panel.
      */
@@ skipping 258 matching lines @@
     }
 
     // --------------------------------------------------------------------------------------------
     // Panel Bar states
     // --------------------------------------------------------------------------------------------
     private float mBarMarginSide;
     private float mBarHeight;
     private boolean mIsBarBorderVisible;
     private float mBarBorderHeight;
 
-    private boolean mBarShadowVisible = false;
-    private float mBarShadowOpacity = 0.f;
+    private boolean mBarShadowVisible;
+    private float mBarShadowOpacity;
 
     private float mArrowIconOpacity;
 
     private float mCloseIconOpacity;
     private float mCloseIconWidth;
 
     /**
      * @return The side margin of the Bar.
      */
     public float getBarMarginSide() {
@@ skipping 75 matching lines @@
             return getOffsetX() + getBarMarginSide();
         } else {
             return getOffsetX() + getWidth() - getBarMarginSide() - getCloseIconDimension();
         }
     }
 
     // --------------------------------------------------------------------------------------------
     // Base Page states
     // --------------------------------------------------------------------------------------------
 
-    private float mBasePageY = 0.0f;
+    private float mBasePageY;
     private float mBasePageBrightness = 1.0f;
 
     /**
      * @return The vertical offset of the base page.
      */
     public float getBasePageY() {
         return mBasePageY;
     }
 
     /**
@@ skipping 682 matching lines @@
      * Overrides the FullWidthSizePanel state for testing.
      *
      * @param isFullWidthSizePanel Whether the Panel has a full width size.
      */
     @VisibleForTesting
     public void setIsFullWidthSizePanelForTesting(boolean isFullWidthSizePanel) {
         mOverrideIsFullWidthSizePanelForTesting = true;
         mIsFullWidthSizePanelForTesting = isFullWidthSizePanel;
     }
 }