Apply gn format with 'sources' sorting to src/

build/secondary/third_party/sfntly/BUILD.gn

Index: build/secondary/third_party/sfntly/BUILD.gn
diff --git a/build/secondary/third_party/sfntly/BUILD.gn b/build/secondary/third_party/sfntly/BUILD.gn
index a4dbd23a78a212a2572524e19cbb41cfea39c4a1..111f1cd9206255ec96ba546c456691f766b3b195 100644
--- a/build/secondary/third_party/sfntly/BUILD.gn
+++ b/build/secondary/third_party/sfntly/BUILD.gn
@@ -4,6 +4,10 @@
 
 static_library("sfntly") {
   sources = [
+    "cpp/src/sample/chromium/font_subsetter.cc",
+    "cpp/src/sample/chromium/font_subsetter.h",
+    "cpp/src/sample/chromium/subsetter_impl.cc",
+    "cpp/src/sample/chromium/subsetter_impl.h",
     "cpp/src/sfntly/data/byte_array.cc",
     "cpp/src/sfntly/data/byte_array.h",
     "cpp/src/sfntly/data/font_data.cc",
@@ -113,10 +117,6 @@ static_library("sfntly") {
     "cpp/src/sfntly/table/truetype/loca_table.h",
     "cpp/src/sfntly/tag.cc",
     "cpp/src/sfntly/tag.h",
-    "cpp/src/sample/chromium/font_subsetter.cc",
-    "cpp/src/sample/chromium/font_subsetter.h",
-    "cpp/src/sample/chromium/subsetter_impl.cc",
-    "cpp/src/sample/chromium/subsetter_impl.h",
   ]
 
   defines = [ "SFNTLY_NO_EXCEPTION" ]