Pass JavaRef to WebContents::FromJavaWebContents.

chrome/browser/android/tab_android.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_ANDROID_TAB_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_TAB_ANDROID_H_
 
 #include <jni.h>
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/android/jni_weak_ref.h"
+#include "base/android/scoped_java_ref.h"
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/search/instant_service_observer.h"
 #include "chrome/browser/sync/glue/synced_tab_delegate_android.h"
 #include "chrome/browser/ui/search/search_tab_helper_delegate.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
 #include "components/favicon/core/favicon_driver_observer.h"
 #include "components/infobars/core/infobar_manager.h"
 #include "components/sessions/core/session_id.h"
@@ skipping 52 matching lines @@
     PARTIAL_PRERENDERED_PAGE_LOAD = 2,
     FULL_PRERENDERED_PAGE_LOAD = 3,
   };
 
   // Convenience method to retrieve the Tab associated with the passed
   // WebContents.  Can return NULL.
   static TabAndroid* FromWebContents(const content::WebContents* web_contents);
 
   // Returns the native TabAndroid stored in the Java Tab represented by
   // |obj|.
-  static TabAndroid* GetNativeTab(JNIEnv* env, jobject obj);
+  static TabAndroid* GetNativeTab(JNIEnv* env,
+                                  const base::android::JavaRef<jobject>& obj);
 
   // Function to attach helpers to the contentView.
   static void AttachTabHelpers(content::WebContents* web_contents);
 
-  TabAndroid(JNIEnv* env, jobject obj);
+  TabAndroid(JNIEnv* env, const base::android::JavaRef<jobject>& obj);
   ~TabAndroid() override;
 
   base::android::ScopedJavaLocalRef<jobject> GetJavaObject();
 
   // Return the WebContents, if any, currently owned by this TabAndroid.
   content::WebContents* web_contents() const { return web_contents_.get(); }
 
   // Return the BlimpContents, if any, currently owned by this TabAndroid.
   blimp::client::BlimpContents* blimp_contents() const {
     return blimp_contents_.get();
@@ skipping 198 matching lines @@
       web_contents_delegate_;
 
   std::unique_ptr<blimp::client::BlimpContents> blimp_contents_;
 
   std::unique_ptr<browser_sync::SyncedTabDelegateAndroid> synced_tab_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(TabAndroid);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_TAB_ANDROID_H_