Remove references to NumberFormatImpl.

The class and header file are gone, so don't try to use them.
Fixes #11312.

headers/os/LocaleKit.h

@@ -21,7 +21,6 @@
 #include <Language.h>
 #include <Locale.h>
 #include <NumberFormat.h>
-#include <NumberFormatImpl.h>
 #include <NumberFormatParameters.h>
 #include <TimeFormat.h>
 #include <UnicodeChar.h>

headers/os/locale/FloatFormatImpl.h

@@ -1,13 +1,11 @@
 #ifndef _B_FLOAT_FORMAT_IMPL_H_
 #define _B_FLOAT_FORMAT_IMPL_H_
 
-#include <NumberFormatImpl.h>
-
 struct format_field_position;
 class BFloatFormatParameters;
 class BString;
 
-class BFloatFormatImpl : public BNumberFormatImpl {
+class BFloatFormatImpl {
 	public:
 		BFloatFormatImpl();
 		virtual ~BFloatFormatImpl();

headers/os/locale/IntegerFormatImpl.h

@@ -1,13 +1,11 @@
 #ifndef _B_INTEGER_FORMAT_IMPL_H_
 #define _B_INTEGER_FORMAT_IMPL_H_
 
-#include <NumberFormatImpl.h>
-
 struct format_field_position;
 class BIntegerFormatParameters;
 class BString;
 
-class BIntegerFormatImpl : public BNumberFormatImpl {
+class BIntegerFormatImpl {
 	public:
 		BIntegerFormatImpl();
 		virtual ~BIntegerFormatImpl();