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

Source/devtools/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 blink_devtools_output_dir = "$root_gen_dir/blink/devtools/"
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("devtools.gypi") ],
     "scope",
@@ skipping 165 matching lines @@
   outputs = [ "$root_out_dir/resources/inspector/devtools_extension_api.js" ]
 
   args = rebase_path(outputs, root_build_dir) +
     rebase_path(gypi_values.devtools_extension_api_files, root_build_dir)
 }
 
 action("supported_css_properties") {
   script = "scripts/generate_supported_css.py"
 
   source_prereqs = [
-    "../core/css/CSSPropertyNames.in",
-    "../core/css/SVGCSSPropertyNames.in",
-    "../core/css/CSSShorthands.in",
+    "../core/css/CSSProperties.in",
   ]
 
   outputs = [
     blink_devtools_output_dir + "SupportedCSSProperties.js"
   ]
 
   args = rebase_path(source_prereqs, root_build_dir) +
     rebase_path(outputs, root_build_dir)
 }
 
@@ skipping 181 matching lines @@
   input_page = "front_end/inspector.html"
   source_prereqs = [ input_page ] + all_devtools_files
   search_path = [ "front_end" ]
 
   outputs = [ "$root_out_dir/resources/inspector/inspector.css" ]
 
   args = [ rebase_path(input_page, root_build_dir) ] +
     rebase_path(search_path, root_build_dir) +
     rebase_path(outputs, root_build_dir)
 }