Readd the clipboard service and get it compiling again.

components/clipboard/clipboard_standalone_impl.h

Index: components/clipboard/clipboard_standalone_impl.h
diff --git a/components/clipboard/clipboard_standalone_impl.h b/components/clipboard/clipboard_standalone_impl.h
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+// Copyright 2014 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 COMPONENTS_CLIPBOARD_CLIPBOARD_STANDALONE_IMPL_H_
+#define COMPONENTS_CLIPBOARD_CLIPBOARD_STANDALONE_IMPL_H_
+
+#include <stdint.h>
+
+#include <string>
+
+#include "base/macros.h"
+#include "components/clipboard/public/interfaces/clipboard.mojom.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace clipboard {
+
+// Stub clipboard implementation.
+//
+// Eventually, we'll actually want to interact with the system clipboard, but
+// that's hard today because the system clipboard is asynchronous (on X11), the
+// ui::Clipboard interface is synchronous (which is what we'd use), mojo is
+// asynchronous across processes, and the WebClipboard interface is synchronous
+// (which is at least tractable).
+class ClipboardStandaloneImpl : public mojo::Clipboard {
+ public:
+  // mojo::Clipboard exposes three possible clipboards.
+  static const int kNumClipboards = 3;
+
+  explicit ClipboardStandaloneImpl(
+      mojo::InterfaceRequest<mojo::Clipboard> request);
+  ~ClipboardStandaloneImpl() override;
+
+  // mojo::Clipboard implementation.
+  void GetSequenceNumber(
+      mojo::Clipboard::Type clipboard_type,
+      const mojo::Callback<void(uint64_t)>& callback) override;
+  void GetAvailableMimeTypes(
+      mojo::Clipboard::Type clipboard_types,
+      const mojo::Callback<void(mojo::Array<mojo::String>)>& callback) override;
+  void ReadMimeType(
+      mojo::Clipboard::Type clipboard_type,
+      const mojo::String& mime_type,
+      const mojo::Callback<void(mojo::Array<uint8_t>)>& callback) override;
+  void WriteClipboardData(
+      mojo::Clipboard::Type clipboard_type,
+      mojo::Map<mojo::String, mojo::Array<uint8_t>> data) override;
+
+ private:
+  uint64_t sequence_number_[kNumClipboards];
+
+  // Internal struct which stores the current state of the clipboard.
+  class ClipboardData;
+
+  // The current clipboard state. This is what is read from.
+  std::unique_ptr<ClipboardData> clipboard_state_[kNumClipboards];
+  mojo::StrongBinding<mojo::Clipboard> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardStandaloneImpl);
+};
+
+}  // namespace clipboard
+
+#endif  // COMPONENTS_CLIPBOARD_CLIPBOARD_STANDALONE_IMPL_H_