Make SkFixed private.

Removed from Chromium in https://codereview.chromium.org/1698083004 and https://codereview.chromium.org/1752953003.

Removed from Android in 895781.

Removed from Google3 in internal cl/118359061.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1839653002

Review URL: https://codereview.chromium.org/1839653002
diff --git a/gyp/core.gypi b/gyp/core.gypi
index 8d558e1..98996ec 100644
--- a/gyp/core.gypi
+++ b/gyp/core.gypi
@@ -353,7 +353,6 @@
         '<(skia_include_path)/core/SkDrawFilter.h',
         '<(skia_include_path)/core/SkDrawLooper.h',
         '<(skia_include_path)/core/SkError.h',
-        '<(skia_include_path)/core/SkFixed.h',
         '<(skia_include_path)/core/SkFlattenable.h',
         '<(skia_include_path)/core/SkFlattenableSerialization.h',
         '<(skia_include_path)/core/SkFontHost.h',
@@ -407,6 +406,7 @@
         # private
         '<(skia_include_path)/private/SkAtomics.h',
         '<(skia_include_path)/private/SkChecksum.h',
+        '<(skia_include_path)/private/SkFixed.h',
         '<(skia_include_path)/private/SkFloatBits.h',
         '<(skia_include_path)/private/SkFloatingPoint.h',
         '<(skia_include_path)/private/SkGpuFenceSync.h',
diff --git a/include/core/SkScalar.h b/include/core/SkScalar.h
index c154609..47c74bc 100644
--- a/include/core/SkScalar.h
+++ b/include/core/SkScalar.h
@@ -8,7 +8,7 @@
 #ifndef SkScalar_DEFINED
 #define SkScalar_DEFINED
 
-#include "SkFixed.h"
+#include "../private/SkFixed.h"
 #include "../private/SkFloatingPoint.h"
 
 // TODO: move this sort of check into SkPostConfig.h
diff --git a/include/core/SkFixed.h b/include/private/SkFixed.h
similarity index 100%
rename from include/core/SkFixed.h
rename to include/private/SkFixed.h