Removing ContentViewCore dependencies from direct WebContents functions.

chrome/android/java/src/org/chromium/chrome/browser/Tab.java

 // Copyright 2014 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;
 
 import android.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Color;
@@ skipping 449 matching lines @@
      *         a bad HTTPS page.
      */
     public boolean isShowingInterstitialPage() {
         return getWebContents() != null && getWebContents().isShowingInterstitialPage();
     }
 
     /**
      * @return Whether or not the tab has something valid to render.
      */
     public boolean isReady() {
-        return mNativePage != null || (mContentViewCore != null && mContentViewCore.isReady());
+        return mNativePage != null || (getWebContents() != null && getWebContents().isReady());
     }
 
     /**
      * @return The {@link View} displaying the current page in the tab. This might be a
      *         native view or a placeholder view for content rendered by the compositor.
      *         This can be {@code null}, if the tab is frozen or being initialized or destroyed.
      */
     public View getView() {
         return mNativePage != null ? mNativePage.getView() :
                 (mContentViewCore != null ? mContentViewCore.getContainerView() : null);
@@ skipping 722 matching lines @@
     private native int nativeLoadUrl(long nativeTabAndroid, String url, String extraHeaders,
             byte[] postData, int transition, String referrerUrl, int referrerPolicy,
             boolean isRendererInitiated);
     private native int nativeGetSecurityLevel(long nativeTabAndroid);
     private native void nativeSetActiveNavigationEntryTitleForUrl(long nativeTabAndroid, String url,
             String title);
     private native boolean nativePrint(long nativeTabAndroid);
     private native Bitmap nativeGetFavicon(long nativeTabAndroid);
     private native boolean nativeIsFaviconValid(long nativeTabAndroid);
 }