Merge .in files for css/svg properties into a single file

Source/core/BUILD.gn

Index: Source/core/BUILD.gn
diff --git a/Source/core/BUILD.gn b/Source/core/BUILD.gn
index 3ba8035957a41f0922085dd434f5c17993e44ab1..f527bd5a60c7135a915139010960cd1fe0fb3857 100644
--- a/Source/core/BUILD.gn
+++ b/Source/core/BUILD.gn
@@ -598,12 +598,8 @@ group("make_core_generated") {
 }
 
 # "CSSPropertyNames" in make_core_generated from GYP.
-process_in_files("make_core_generated_css_property_names") {
+css_properties("make_core_generated_css_property_names") {
   script = "../build/scripts/make_css_property_names.py"
-  in_files = [ 
-    "css/CSSPropertyNames.in",
-    "css/SVGCSSPropertyNames.in",
-  ]
   outputs = [
     "$blink_core_output_dir/CSSPropertyNames.cpp",
     "$blink_core_output_dir/CSSPropertyNames.h",
@@ -626,11 +622,8 @@ process_in_files("make_core_generated_media_features") {
 }
 
 # "StylePropertyShorthand" in make_core_generated from GYP.
-process_in_files("make_core_generated_style_property_shorthand") {
+css_properties("make_core_generated_style_property_shorthand") {
   script = "../build/scripts/make_style_shorthands.py"
-  in_files = [
-    "css/CSSShorthands.in",
-  ]
   other_inputs = [
     "../build/scripts/templates/StylePropertyShorthand.cpp.tmpl",
     "../build/scripts/templates/StylePropertyShorthand.h.tmpl",
@@ -642,12 +635,8 @@ process_in_files("make_core_generated_style_property_shorthand") {
 }
 
 # "StyleBuilder" in make_core_generated from GYP.
-process_in_files("make_core_generated_style_builder") {
+css_properties("make_core_generated_style_builder") {
   script = "../build/scripts/make_style_builder.py"
-
-  in_files = [
-    "css/CSSProperties.in",
-  ]
   other_inputs = [
     "../build/scripts/templates/StyleBuilder.cpp.tmpl",
     "../build/scripts/templates/StyleBuilderFunctions.cpp.tmpl",