Rename JavaObjectWeakGlobalRef::is_empty to avoid misuse.

ui/platform_window/android/platform_window_android.cc

 // Copyright 2015 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 "ui/platform_window/android/platform_window_android.h"
 
 #include <android/input.h>
 #include <android/native_window_jni.h>
 
 #include "base/android/context_utils.h"
@@ skipping 142 matching lines @@
 
 void PlatformWindowAndroid::ReleaseWindow() {
   ANativeWindow_release(window_);
   window_ = NULL;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // PlatformWindowAndroid, PlatformWindow implementation:
 
 void PlatformWindowAndroid::Show() {
-  if (!java_platform_window_android_.is_empty())
+  if (!java_platform_window_android_.is_uninitialized())
     return;
   JNIEnv* env = base::android::AttachCurrentThread();
   java_platform_window_android_ = JavaObjectWeakGlobalRef(
       env, Java_PlatformWindowAndroid_createForActivity(
                env, base::android::GetApplicationContext(),
                reinterpret_cast<jlong>(this),
                reinterpret_cast<jlong>(&platform_ime_controller_)).obj());
 }
 
 void PlatformWindowAndroid::Hide() {
@@ skipping 50 matching lines @@
 
 void PlatformWindowAndroid::ConfineCursorToBounds(const gfx::Rect& bounds) {
   NOTIMPLEMENTED();
 }
 
 PlatformImeController* PlatformWindowAndroid::GetPlatformImeController() {
   return &platform_ime_controller_;
 }
 
 }  // namespace ui