Hook up WebRTC logging extension API to the underlying functionality.

base/supports_user_data.h

Index: base/supports_user_data.h
diff --git a/base/supports_user_data.h b/base/supports_user_data.h
index 77367553daf5b405d5fffa138614d6a64b0234f0..6d515d7341ebc60c641dae9a145bdd9b389e3bbf 100644
--- a/base/supports_user_data.h
+++ b/base/supports_user_data.h
@@ -61,7 +61,7 @@ class BASE_EXPORT SupportsUserData {
 template <typename T>
 class UserDataAdapter : public base::SupportsUserData::Data {
  public:
-  static T* Get(SupportsUserData* supports_user_data, const char* key) {
+  static T* Get(SupportsUserData* supports_user_data, const void* key) {
     UserDataAdapter* data =
       static_cast<UserDataAdapter*>(supports_user_data->GetUserData(key));
     return data ? static_cast<T*>(data->object_.get()) : NULL;