Rename JavaObjectWeakGlobalRef::is_empty to avoid misuse.

content/browser/android/java/gin_java_method_invocation_helper.cc

Index: content/browser/android/java/gin_java_method_invocation_helper.cc
diff --git a/content/browser/android/java/gin_java_method_invocation_helper.cc b/content/browser/android/java/gin_java_method_invocation_helper.cc
index 9c9cc09bdeb6a8dbbc757927f0ca0ae46b5afeb1..a2e73ef2d695803b7551dd98a808f574d52d0652 100644
--- a/content/browser/android/java/gin_java_method_invocation_helper.cc
+++ b/content/browser/android/java/gin_java_method_invocation_helper.cc
@@ -100,7 +100,7 @@ bool GinJavaMethodInvocationHelper::AppendObjectRef(
     if (iter == object_refs_.end()) {
       JavaObjectWeakGlobalRef object_ref(
           dispatcher->GetObjectWeakRef(object_id));
-      if (!object_ref.is_empty()) {
+      if (!object_ref.is_uninitialized()) {
         object_refs_.insert(std::make_pair(object_id, object_ref));
       }
     }