Make //mojo/edk/js a component.

mojo/edk/js/mojo_runner_delegate.h

 // Copyright 2013 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.
 
 #ifndef MOJO_EDK_JS_MOJO_RUNNER_DELEGATE_H_
 #define MOJO_EDK_JS_MOJO_RUNNER_DELEGATE_H_
 
 #include "base/macros.h"
 #include "gin/modules/module_runner_delegate.h"
+#include "mojo/edk/js/js_export.h"
 #include "mojo/public/c/system/core.h"
 
 namespace mojo {
 namespace edk {
 namespace js {
 
-class MojoRunnerDelegate : public gin::ModuleRunnerDelegate {
+class MOJO_JS_EXPORT MojoRunnerDelegate : public gin::ModuleRunnerDelegate {
  public:
   MojoRunnerDelegate();
   ~MojoRunnerDelegate() override;
 
   void Start(gin::Runner* runner, MojoHandle pipe, const std::string& module);
 
  private:
   // From ModuleRunnerDelegate:
   void UnhandledException(gin::ShellRunner* runner,
                           gin::TryCatch& try_catch) override;
 
   DISALLOW_COPY_AND_ASSIGN(MojoRunnerDelegate);
 };
 
 }  // namespace js
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_JS_MOJO_RUNNER_DELEGATE_H_