Move CFX_UnownedPtr to UnownedPtr

This CL moves CFX_UnownedPtr to UnownedPtr and places in the fxcrt
namespace.

Bug: pdfium:898
Change-Id: I6d1fa463f365e5cb3aafa8c8a7a5f7eff62ed8e0
Reviewed-on: https://pdfium-review.googlesource.com/14620
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
diff --git a/fpdfsdk/cpdfsdk_annothandlermgr.h b/fpdfsdk/cpdfsdk_annothandlermgr.h
index 21ccb3a..df4e1a2 100644
--- a/fpdfsdk/cpdfsdk_annothandlermgr.h
+++ b/fpdfsdk/cpdfsdk_annothandlermgr.h
@@ -11,8 +11,8 @@
 #include <memory>
 
 #include "core/fpdfdoc/cpdf_annot.h"
-#include "core/fxcrt/cfx_unowned_ptr.h"
 #include "core/fxcrt/fx_coordinates.h"
+#include "core/fxcrt/unowned_ptr.h"
 #include "fpdfsdk/cpdfsdk_annot.h"
 
 class CFX_Matrix;