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/fpdf_sysfontinfo.cpp b/fpdfsdk/fpdf_sysfontinfo.cpp
index 875f3fd..67b9a08 100644
--- a/fpdfsdk/fpdf_sysfontinfo.cpp
+++ b/fpdfsdk/fpdf_sysfontinfo.cpp
@@ -124,7 +124,7 @@
 }
 
 struct FPDF_SYSFONTINFO_DEFAULT : public FPDF_SYSFONTINFO {
-  CFX_UnownedPtr<IFX_SystemFontInfo> m_pFontInfo;
+  UnownedPtr<IFX_SystemFontInfo> m_pFontInfo;
 };
 
 static void DefaultRelease(struct _FPDF_SYSFONTINFO* pThis) {