Remove unused data member in ContentViewRenderView class.

This patch removes data member |mSurfaceCallback| from
ContentViewRenderView which is not being used at class level.

Bug: None

Change-Id: Ib7d55dc13cb767df11cbfaf7c7942edecaa1709d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522794Reviewed-by: Prashant Nevase <prashant.n@samsung.com>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Cr-Commit-Position: refs/heads/master@{#837455}

AUTHORS

@@ -557,6 +557,7 @@ Kangyuan Shu <kangyuan.shu@intel.com>
 Karan Thakkar <karanjthakkar@gmail.com>
 Kartikey Bhatt <kartikey@amazon.com>
 Kaspar Brand <googlecontrib@velox.ch>
+Kaushalendra Mishra <k.mishra@samsung.com>
 Kaustubh Atrawalkar <kaustubh.a@samsung.com>
 Kaustubh Atrawalkar <kaustubh.ra@gmail.com>
 Ke He <ke.he@intel.com>

components/embedder_support/android/java/src/org/chromium/components/embedder_support/view/ContentViewRenderView.java

@@ -29,7 +29,6 @@ import org.chromium.ui.base.WindowAndroid;
 public class ContentViewRenderView extends FrameLayout {
     // The native side of this object.
     private long mNativeContentViewRenderView;
-    private SurfaceHolder.Callback mSurfaceCallback;
     private WindowAndroid mWindowAndroid;
 
     protected SurfaceBridge mSurfaceBridge;