New Mojom parser: Remove dependency on CGO.

mojo/go/rules.gni

 # 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.
 
 declare_args() {
   # By default, there is no go build tool, because go builds are not supported.
   go_build_tool = ""
 }
 
 # Declare a go library.
@@ skipping 83 matching lines @@
              "--",
              "${go_build_tool}",
              rebase_path(build_dir, root_build_dir),
              rebase_path(target_out_dir, root_build_dir) + "/${target_name}",
              rebase_path("//", root_build_dir),
              rebase_path(root_out_dir, root_build_dir),
              "-I" + rebase_path("//"),
              "-L" + rebase_path(target_out_dir) + " -l" + static_library_name +
                  " -lstdc++ -lpthread -lm -lglib-2.0 -lrt",
              "test",
+             "-tags",
+             "include_mojo_cgo",
              "-c",
            ] + rebase_path(invoker.sources, build_dir)
   }
 }
 
 # Declare a go binary target.
 #
 # The target generates a go executable, optionally linking against C code,
 # which is compiled into a static library and linked against Go.
 #
@@ skipping 128 matching lines @@
     args += [
       "--",
       "${go_build_tool}",
       rebase_path(build_dir, root_build_dir),
       rebase_path(target_out_dir, root_build_dir) + "/${target_name}",
       rebase_path("//", root_build_dir),
       rebase_path(root_out_dir, root_build_dir),
       "-I" + rebase_path("//"),
       "-L" + rebase_path(target_out_dir) + " -l" + static_library_name + "",
       "build",
+      "-tags",
+      "include_mojo_cgo",
     ]
     args += [ "-buildmode=c-shared" ]
     args += rebase_path(invoker.sources, build_dir)
   }
 
   copy(target_name) {
     deps = [
       ":${go_library_name}",
     ]
     sources = [
       "${target_out_dir}/${go_library_name}",
     ]
     outputs = [
       "${root_out_dir}/${target_name}.mojo",
     ]
   }
 }