[gn] Use one source of truth for test source files.

tools/gcmole/gcmole.lua

 -- Copyright 2011 the V8 project authors. All rights reserved.
 -- Redistribution and use in source and binary forms, with or without
 -- modification, are permitted provided that the following conditions are
 -- met:
 --
 --     * Redistributions of source code must retain the above copyright
 --       notice, this list of conditions and the following disclaimer.
 --     * Redistributions in binary form must reproduce the above
 --       copyright notice, this list of conditions and the following
 --       disclaimer in the documentation and/or other materials provided
@@ skipping 179 matching lines @@
        { "test/cctest/cctest.gyp", "'(test-[^']-%.cc)'", "test/cctest/" }
    }
 
    for i = 1, #gyp_files do
       local filename = gyp_files[i][1]
       local pattern = gyp_files[i][2]
       local prefix = gyp_files[i][3]
       local gyp_file = assert(io.open(filename), "failed to open GYP file")
       local gyp = gyp_file:read('*a')
       for condition, sources in
-         gyp:gmatch "'sources': %[.-### gcmole%((.-)%) ###(.-)%]" do
+         gyp:gmatch "%[.-### gcmole%((.-)%) ###(.-)%]" do
          if result[condition] == nil then result[condition] = {} end
          for file in sources:gmatch(pattern) do
             table.insert(result[condition], prefix .. file)
          end
       end
       gyp_file:close()
    end
 
    return result
 end
@@ skipping 232 matching lines @@
 
 for _, arch in ipairs(ARCHS) do
    if not ARCHITECTURES[arch] then
       error ("Unknown arch: " .. arch)
    end
 
    errors = SafeCheckCorrectnessForArch(arch, report) or errors
 end
 
 os.exit(errors and 1 or 0)