Remove include of fx_extension.h from cfgas_fontmgr.h

It isn't needed and it is big due to its own inclusion of ICU
headers. fx_extension is now only included by .cpp files.

Change-Id: I6f6493e66e66a1e74d812ff049d00e7ff1b28f48
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/82793
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Auto-Submit: Tom Sepez <tsepez@chromium.org>
diff --git a/xfa/fgas/font/cfgas_fontmgr.cpp b/xfa/fgas/font/cfgas_fontmgr.cpp
index e23df75..d30ae44 100644
--- a/xfa/fgas/font/cfgas_fontmgr.cpp
+++ b/xfa/fgas/font/cfgas_fontmgr.cpp
@@ -13,6 +13,7 @@
 #include "build/build_config.h"
 #include "core/fxcrt/cfx_memorystream.h"
 #include "core/fxcrt/fx_codepage.h"
+#include "core/fxcrt/fx_extension.h"
 #include "core/fxcrt/fx_memory_wrappers.h"
 #include "core/fxge/cfx_font.h"
 #include "core/fxge/cfx_fontmapper.h"
diff --git a/xfa/fgas/font/cfgas_fontmgr.h b/xfa/fgas/font/cfgas_fontmgr.h
index ac7171b..6f4828b 100644
--- a/xfa/fgas/font/cfgas_fontmgr.h
+++ b/xfa/fgas/font/cfgas_fontmgr.h
@@ -14,7 +14,6 @@
 #include <vector>
 
 #include "build/build_config.h"
-#include "core/fxcrt/fx_extension.h"
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/retain_ptr.h"
 #include "core/fxge/cfx_face.h"