Remove spellchecker feedback.

components/spellcheck/common/spellcheck_marker.h

-// Copyright (c) 2013 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_SPELLCHECK_COMMON_SPELLCHECK_MARKER_H_
-#define COMPONENTS_SPELLCHECK_COMMON_SPELLCHECK_MARKER_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-class SpellCheckMarker {
- public:
-  // A predicate to test spellcheck marker validity.
-  class IsValidPredicate {
-   public:
-    typedef SpellCheckMarker argument_type;
-    explicit IsValidPredicate(size_t text_length) : text_length_(text_length) {}
-    bool operator()(const SpellCheckMarker& marker) const {
-      return marker.offset < text_length_;
-    }
-
-   private:
-    size_t text_length_;
-  };
-
-  // IPC requires a default constructor.
-  SpellCheckMarker() : hash(0xFFFFFFFF), offset(UINT32_MAX) {}
-
-  SpellCheckMarker(uint32_t hash, uint32_t offset)
-      : hash(hash), offset(offset) {}
-
-  uint32_t hash;
-  // Note: we use uint32_t instead of size_t because this struct is sent over
-  // IPC which could span 32 & 64 bit processes. This is fine since the offset
-  // shouldn't exceed UINT32_MAX even on 64 bit builds.
-  uint32_t offset;
-};
-
-#endif  // COMPONENTS_SPELLCHECK_COMMON_SPELLCHECK_MARKER_H_