Rename JavaObjectWeakGlobalRef::is_empty to avoid misuse.

ui/platform_window/android/platform_ime_controller_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_ime_controller_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "jni/PlatformImeControllerAndroid_jni.h"
 
 using base::android::JavaParamRef;
 using base::android::ScopedJavaLocalRef;
 
 namespace ui {
 
 // static
 bool PlatformImeControllerAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 PlatformImeControllerAndroid::PlatformImeControllerAndroid() {
 }
 
 PlatformImeControllerAndroid::~PlatformImeControllerAndroid() {
 }
 
 void PlatformImeControllerAndroid::Init(JNIEnv* env,
                                         const JavaParamRef<jobject>& jobj) {
-  DCHECK(java_platform_ime_controller_android_.is_empty());
+  DCHECK(java_platform_ime_controller_android_.is_uninitialized());
   java_platform_ime_controller_android_ = JavaObjectWeakGlobalRef(env, jobj);
 }
 
 void PlatformImeControllerAndroid::UpdateTextInputState(
     const TextInputState& state) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jobject> scoped_obj =
       java_platform_ime_controller_android_.get(env);
   if (scoped_obj.is_null())
     return;
   Java_PlatformImeControllerAndroid_updateTextInputState(
       env, scoped_obj, state.type, state.flags,
       base::android::ConvertUTF8ToJavaString(env, state.text),
       state.selection_start, state.selection_end, state.composition_start,
       state.composition_end);
 }
 
 void PlatformImeControllerAndroid::SetImeVisibility(bool visible) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jobject> scoped_obj =
       java_platform_ime_controller_android_.get(env);
   if (scoped_obj.is_null())
     return;
   Java_PlatformImeControllerAndroid_setImeVisibility(env, scoped_obj, visible);
 }
 
 }  // namespace ui