Expose WindowAndroid from WebContents.

chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
index 93b4a79903b0ca39ac873c8d15723355578fec5e..36745ee0102b19d696ec67b5b002b30c616316b1 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
@@ -10,7 +10,6 @@ import android.support.annotation.Nullable;
 
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.chrome.browser.share.ShareHelper;
-import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.mojo.system.MojoException;
 import org.chromium.ui.base.WindowAndroid;
@@ -82,10 +81,7 @@ public class ShareServiceImpl implements ShareService {
     private static Activity activityFromWebContents(@Nullable WebContents webContents) {
         if (webContents == null) return null;
 
-        ContentViewCore contentViewCore = ContentViewCore.fromWebContents(webContents);
-        if (contentViewCore == null) return null;
-
-        WindowAndroid window = contentViewCore.getWindowAndroid();
+        WindowAndroid window = webContents.getTopLevelNativeWindow();
         if (window == null) return null;
 
         return window.getActivity().get();