Rename JavaObjectWeakGlobalRef::is_empty to avoid misuse.

base/android/jni_weak_ref.h

 // 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.
 
 #ifndef BASE_ANDROID_JNI_WEAK_REF_H_
 #define BASE_ANDROID_JNI_WEAK_REF_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 11 matching lines @@
   JavaObjectWeakGlobalRef(JNIEnv* env, jobject obj);
   JavaObjectWeakGlobalRef(JNIEnv* env,
                           const base::android::JavaRef<jobject>& obj);
   virtual ~JavaObjectWeakGlobalRef();
 
   void operator=(const JavaObjectWeakGlobalRef& rhs);
   void operator=(JavaObjectWeakGlobalRef&& rhs);
 
   base::android::ScopedJavaLocalRef<jobject> get(JNIEnv* env) const;
 
-  bool is_empty() const { return obj_ == nullptr; }
+  // Returns true if the weak reference has not been initialized to point at
+  // an object (or ḣas had reset() called).
+  // Do not call this to test if the object referred to still exists! The weak
+  // reference remains initialized even if the target object has been collected.
+  bool is_uninitialized() const { return obj_ == nullptr; }
 
   void reset();
 
  private:
   void Assign(const JavaObjectWeakGlobalRef& rhs);
 
   jweak obj_;
 };
 
 // Get the real object stored in the weak reference returned as a
 // ScopedJavaLocalRef.
 BASE_EXPORT base::android::ScopedJavaLocalRef<jobject> GetRealObject(
     JNIEnv* env, jweak obj);
 
 #endif  // BASE_ANDROID_JNI_WEAK_REF_H_