Fix CFX_GEModule destruction order.

The platform must outlive the font mgr (which owns the FT library)
which must outlive the font cache. This will enable faces to be
properly ref-counted in a subsequent patch, since the font cache
won't keep faces alive beyond the lifespan of the library.

Change-Id: I448dea06cf38cb62c604c9a71ff89404823f9adc
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/54850
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

core/fxge/cfx_gemodule.cpp

diff --git a/core/fxge/cfx_gemodule.cpp b/core/fxge/cfx_gemodule.cpp
index ea6b4ac..5d268bf 100644
--- a/core/fxge/cfx_gemodule.cpp
+++ b/core/fxge/cfx_gemodule.cpp
@@ -18,9 +18,9 @@
 }  // namespace
 
 CFX_GEModule::CFX_GEModule(const char** pUserFontPaths)
-    : m_pFontCache(pdfium::MakeUnique<CFX_FontCache>()),
+    : m_pPlatform(PlatformIface::Create()),
       m_pFontMgr(pdfium::MakeUnique<CFX_FontMgr>()),
-      m_pPlatform(PlatformIface::Create()),
+      m_pFontCache(pdfium::MakeUnique<CFX_FontCache>()),
       m_pUserFontPaths(pUserFontPaths) {}
 
 CFX_GEModule::~CFX_GEModule() = default;

core/fxge/cfx_gemodule.h

diff --git a/core/fxge/cfx_gemodule.h b/core/fxge/cfx_gemodule.h
index 59eddb7..47e2667 100644
--- a/core/fxge/cfx_gemodule.h
+++ b/core/fxge/cfx_gemodule.h
@@ -35,9 +35,9 @@
   explicit CFX_GEModule(const char** pUserFontPaths);
   ~CFX_GEModule();
 
-  std::unique_ptr<CFX_FontCache> const m_pFontCache;
-  std::unique_ptr<CFX_FontMgr> const m_pFontMgr;
   std::unique_ptr<PlatformIface> const m_pPlatform;
+  std::unique_ptr<CFX_FontMgr> const m_pFontMgr;
+  std::unique_ptr<CFX_FontCache> const m_pFontCache;
   const char** const m_pUserFontPaths;
 };