Pass JavaRef to WebContents::FromJavaWebContents.

content/browser/web_contents/web_contents_android.cc

 // Copyright 2013 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 "content/browser/web_contents/web_contents_android.h"
 
 #include <stdint.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
@@ skipping 28 matching lines @@
 #include "ui/gfx/android/device_display_info.h"
 #include "ui/gfx/android/java_bitmap.h"
 #include "ui/gfx/geometry/rect.h"
 
 using base::android::AttachCurrentThread;
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertJavaStringToUTF16;
 using base::android::ConvertUTF8ToJavaString;
 using base::android::ConvertUTF16ToJavaString;
 using base::android::JavaParamRef;
+using base::android::JavaRef;
 using base::android::ScopedJavaGlobalRef;
 using base::android::ScopedJavaLocalRef;
 using base::android::ToJavaIntArray;
 
 namespace content {
 
 namespace {
 
 // Track all WebContentsAndroid objects here so that we don't deserialize a
 // destroyed WebContents object.
@@ skipping 115 matching lines @@
   gfx::Rect parent_rect;
   ScopedJavaLocalRef<jobject> j_root =
       WalkAXTreeDepthFirst(env, root, parent_rect, &params);
   Java_WebContentsImpl_onAccessibilitySnapshot(env, j_root, callback);
 }
 
 }  // namespace
 
 // static
 WebContents* WebContents::FromJavaWebContents(
-    jobject jweb_contents_android) {
+    const JavaRef<jobject>& jweb_contents_android) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  if (!jweb_contents_android)
+  if (jweb_contents_android.is_null())
     return NULL;
 
   WebContentsAndroid* web_contents_android =
       reinterpret_cast<WebContentsAndroid*>(
           Java_WebContentsImpl_getNativePointer(AttachCurrentThread(),
                                                 jweb_contents_android));
   if (!web_contents_android)
     return NULL;
   return web_contents_android->web_contents();
 }
@@ skipping 523 matching lines @@
   }
   for (const gfx::Size& size : sizes) {
     Java_WebContentsImpl_createSizeAndAddToList(env, jsizes, size.width(),
                                                 size.height());
   }
   Java_WebContentsImpl_onDownloadImageFinished(env, obj->obj(), callback->obj(),
                                                id, http_status_code, jurl,
                                                jbitmaps, jsizes);
 }
 }  // namespace content