Change log to avoid polluting logcat.

Change-Id: I804afe9e3a78876f4fc2d74ae084419530435840
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 44cc9b7..262505b 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -5620,10 +5620,10 @@
                                         k,
                                         iface,
                                         image_pointer_size_)) {
-          LOG(WARNING) << "Conflicting default method implementations found: "
-                       << PrettyMethod(current_method) << " and "
-                       << PrettyMethod(*out_default_method) << " in class "
-                       << PrettyClass(klass.Get()) << " conflict.";
+          VLOG(class_linker) << "Conflicting default method implementations found: "
+                             << PrettyMethod(current_method) << " and "
+                             << PrettyMethod(*out_default_method) << " in class "
+                             << PrettyClass(klass.Get()) << " conflict.";
           *out_default_method = nullptr;
           return DefaultMethodSearchResult::kDefaultConflict;
         } else {