Move fetching logic out of ApplicationManager, eliminate url mappings.

mojo/fetcher/about_fetcher.h

 // Copyright 2015 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_RUNNER_ABOUT_FETCHER_H_
-#define MOJO_RUNNER_ABOUT_FETCHER_H_
+#ifndef MOJO_FETCHER_ABOUT_FETCHER_H_
+#define MOJO_FETCHER_ABOUT_FETCHER_H_
 
 #include "mojo/shell/fetcher.h"
 
 #include "base/macros.h"
 #include "mojo/services/network/public/interfaces/url_loader.mojom.h"
 #include "url/gurl.h"
 
 namespace mojo {
-namespace runner {
+namespace fetcher {
 
 // Implements Fetcher for about: URLs.
 class AboutFetcher : public shell::Fetcher {
  public:
   static const char kAboutScheme[];
   static const char kAboutBlankURL[];
 
   static void Start(const GURL& url, const FetchCallback& loader_callback);
 
  private:
@@ skipping 19 matching lines @@
   std::string MimeType() override;
   bool HasMojoMagic() override;
   bool PeekFirstLine(std::string* line) override;
 
   const GURL url_;
   URLResponsePtr response_;
 
   DISALLOW_COPY_AND_ASSIGN(AboutFetcher);
 };
 
-}  // namespace runner
+}  // namespace fetcher
 }  // namespace mojo
 
-#endif  // MOJO_RUNNER_ABOUT_FETCHER_H_
+#endif  // MOJO_FETCHER_ABOUT_FETCHER_H_