Refactor getInstalledRelatedApps code and add manifest logic and tests.

third_party/WebKit/public/platform/modules/installedapp/WebInstalledAppClient.h

Index: third_party/WebKit/public/platform/modules/installedapp/WebInstalledAppClient.h
diff --git a/third_party/WebKit/public/platform/modules/installedapp/WebInstalledAppClient.h b/third_party/WebKit/public/platform/modules/installedapp/WebInstalledAppClient.h
deleted file mode 100644
index ad8e0ffd0f497dbd7d458ab8ba0f3611ab576848..0000000000000000000000000000000000000000
--- a/third_party/WebKit/public/platform/modules/installedapp/WebInstalledAppClient.h
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2016 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 WebInstalledAppClient_h
-#define WebInstalledAppClient_h
-
-#include "public/platform/WebCallbacks.h"
-#include "public/platform/WebSecurityOrigin.h"
-#include "public/platform/WebVector.h"
-#include "public/platform/modules/installedapp/WebRelatedApplication.h"
-
-namespace blink {
-
-using AppInstalledCallbacks =
-    WebCallbacks<const WebVector<WebRelatedApplication>&, void>;
-
-class WebInstalledAppClient {
- public:
-  virtual ~WebInstalledAppClient() {}
-
-  // Takes ownership of the AppInstalledCallbacks.
-  virtual void getInstalledRelatedApps(
-      const WebSecurityOrigin&,
-      std::unique_ptr<AppInstalledCallbacks>) = 0;
-};
-
-}  // namespace blink
-
-#endif  // WebInstalledAppClient_h