Remove unused _IMPL_NS_GFXNONXP define.

Thanks to Stephen Walker <walk84@yahoo.com> for the patch.
Bug #162117 r=cls

gfx/src/gtk/Makefile.in

@@ -144,7 +144,6 @@ ifdef MOZ_ENABLE_XINERAMA
 GFX_XINERAMA_LIBS += $(MOZ_XINERAMA_LIBS)
 endif
 
-DEFINES		+= -D_IMPL_NS_GFXNONXP
 ifeq ($(OS_ARCH), Linux)
 DEFINES         += -D_BSD_SOURCE
 endif

gfx/src/photon/Makefile.in

@@ -70,8 +70,6 @@ EXTRA_DSO_LDOPTS += $(MOZ_COMPONENT_LIBS) \
 		-lgkgfx \
 		$(NULL)
 
-DEFINES		+= -D_IMPL_NS_GFXNONXP
-
 INCLUDES	+= \
 		-I$(srcdir)/. \
 		-I$(srcdir)/.. \

gfx/src/qt/Makefile.in

@@ -77,7 +77,6 @@ EXTRA_DSO_LDOPTS += $(MOZ_COMPONENT_LIBS) \
 		$(MOZ_JS_LIBS) \
                 $(NULL)
 
-DEFINES		+= -D_IMPL_NS_GFXNONXP
 ifeq ($(OS_ARCH), Linux)
 DEFINES         += -D_BSD_SOURCE
 endif

gfx/src/windows/Makefile.in

@@ -97,7 +97,7 @@ libs:: fontEncoding.properties
 install:: fontEncoding.properties
 	$(INSTALL) $^ $(DESTDIR)$(mozappdir)/res/fonts
 
-DEFINES	+= -D_IMPL_NS_GFXNONXP -DWIN32_LEAN_AND_MEAN -DSTRICT 
+DEFINES	+= -DWIN32_LEAN_AND_MEAN -DSTRICT 
 
 EXTRA_DSO_LDOPTS += \
 		$(EXTRA_DSO_LIBS) \

gfx/src/xlib/Makefile.in

@@ -112,7 +112,7 @@ EXTRA_DSO_LDOPTS += \
 		$(GFX_XIE_LIBS) \
 		$(NULL)
 
-DEFINES		+= -D_IMPL_NS_GFXNONXP -DUSE_MOZILLA_TYPES
+DEFINES		+= -DUSE_MOZILLA_TYPES
 
 ifeq ($(OS_ARCH), Linux)
 DEFINES         += -D_BSD_SOURCE

xpcom/base/nsComObsolete.h

@@ -43,14 +43,6 @@
 #define NS_WIDGET NS_IMPORT
 #endif
 
-#ifdef _IMPL_NS_GFXNONXP
-#define NS_GFXNONXP NS_EXPORT
-#define NS_GFXNONXP_(type) NS_EXPORT_(type)
-#else
-#define NS_GFXNONXP NS_IMPORT
-#define NS_GFXNONXP_(type) NS_IMPORT_(type)
-#endif
-
 #ifdef _IMPL_NS_GFX
 #define NS_GFX NS_EXPORT
 #define NS_GFX_(type) NS_EXPORT_(type)