Move WebMIMERegistry impl from //content to blink:platform/network/mime

third_party/WebKit/Source/platform/network/mime/MockMimeRegistry.h

+// 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 MockMimeRegistry_h
+#define MockMimeRegistry_h
+
+#include "net/base/mime_util.h"
+#include "public/platform/FilePathConversion.h"
+#include "public/platform/mime_registry.mojom-blink.h"
+
+namespace blink {
+
+// Used for unit tests.
+class MockMimeRegistry : public mojom::blink::MimeRegistry {
+ public:
+  MockMimeRegistry() = default;
+  ~MockMimeRegistry() = default;
+
+  void GetMimeTypeFromExtension(
+      const String& ext,
+      const GetMimeTypeFromExtensionCallback& callback) override {
+    std::string mimeType;
+    net::GetMimeTypeFromExtension(WebStringToFilePath(ext).value(), &mimeType);
+    callback.Run(String::fromUTF8(mimeType.data(), mimeType.length()));
+  }
+};
+
+}  // namespace blink
+
+#endif  // MockMimeRegistry_h