Introduce apps API target in //apps and move app.runtime API into it

chrome/browser/extensions/api/file_handlers/app_file_handler_util.h

Index: chrome/browser/extensions/api/file_handlers/app_file_handler_util.h
diff --git a/chrome/browser/extensions/api/file_handlers/app_file_handler_util.h b/chrome/browser/extensions/api/file_handlers/app_file_handler_util.h
index 4dd7300ae1570018658ae92a55294bf21cb4d955..14bd11cf1deda85502ce3b5ad90f60efd2cf2997 100644
--- a/chrome/browser/extensions/api/file_handlers/app_file_handler_util.h
+++ b/chrome/browser/extensions/api/file_handlers/app_file_handler_util.h
@@ -16,6 +16,12 @@
 
 class Profile;
 
+namespace apps {
+namespace file_handler_util {
+struct GrantedFileEntry;
+}
+}
+
 namespace extensions {
 class ExtensionPrefs;
 
@@ -51,18 +57,9 @@ bool FileHandlerCanHandleFile(
     const std::string& mime_type,
     const base::FilePath& path);
 
-// Refers to a file entry that a renderer has been given access to.
-struct GrantedFileEntry {
-  GrantedFileEntry();
-
-  std::string id;
-  std::string filesystem_id;
-  std::string registered_name;
-};
-
 // Creates a new file entry and allows |renderer_id| to access |path|. This
 // registers a new file system for |path|.
-GrantedFileEntry CreateFileEntry(
+apps::file_handler_util::GrantedFileEntry CreateFileEntry(
     Profile* profile,
     const Extension* extension,
     int renderer_id,