Revert of Moves code from chromeos/ime to ui/base/ime/chromeos.

chromeos/ime/composition_text.cc

+// 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.
+
+#include "chromeos/ime/composition_text.h"
+
+namespace chromeos {
+
+CompositionText::CompositionText()
+  : selection_start_(0),
+    selection_end_(0) {}
+
+CompositionText::~CompositionText() {}
+
+void CompositionText::CopyFrom(const CompositionText& obj) {
+  text_ = obj.text();
+  underline_attributes_ = obj.underline_attributes();
+  selection_start_ = obj.selection_start();
+  selection_end_ = obj.selection_end();
+}
+
+}  // namespace chromeos