Update base/ to use scoped_refptr<T>::get() rather than implicit "operator T*"

base/callback_internal.cc

Index: base/callback_internal.cc
diff --git a/base/callback_internal.cc b/base/callback_internal.cc
index 2dde402ae9ef306a36ce49440a1b8e85460ef7b1..5acade0ccb8da5d11ff9fe2953d4762f377c37d3 100644
--- a/base/callback_internal.cc
+++ b/base/callback_internal.cc
@@ -28,7 +28,7 @@ bool CallbackBase::Equals(const CallbackBase& other) const {
 CallbackBase::CallbackBase(BindStateBase* bind_state)
     : bind_state_(bind_state),
       polymorphic_invoke_(NULL) {
-  DCHECK(!bind_state_ || bind_state_->HasOneRef());
+  DCHECK(!bind_state_.get() || bind_state_->HasOneRef());
 }
 
 CallbackBase::~CallbackBase() {