Pass JavaRef to WebContents::FromJavaWebContents.

chrome/browser/android/tab_state.cc

 // 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.
 
 #include "chrome/browser/android/tab_state.h"
 
 #include <jni.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 553 matching lines @@
   return result;
 }
 
 // Creates a historical tab entry from the serialized tab contents contained
 // within |state|.
 static void CreateHistoricalTab(JNIEnv* env,
                                 const JavaParamRef<jclass>& clazz,
                                 const JavaParamRef<jobject>& state,
                                 jint saved_state_version) {
   std::unique_ptr<WebContents> web_contents(WebContents::FromJavaWebContents(
-      WebContentsState::RestoreContentsFromByteBuffer(env, clazz, state,
-                                                      saved_state_version, true)
-          .obj()));
+      WebContentsState::RestoreContentsFromByteBuffer(
+          env, clazz, state, saved_state_version, true)));
   if (web_contents.get())
     TabAndroid::CreateHistoricalTabFromContents(web_contents.get());
 }
 
 bool RegisterTabState(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }