Replace ViewHostMsg_TextInputState_Params with content::TextInputState.

content/common/text_input_state.cc

+// 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.
+
+#include "content/common/text_input_state.h"
+
+namespace content {
+
+TextInputState::TextInputState()
+    : type(ui::TEXT_INPUT_TYPE_NONE),
+      mode(ui::TEXT_INPUT_MODE_DEFAULT),
+      flags(0),
+      selection_start(0),
+      selection_end(0),
+      composition_start(-1),
+      composition_end(-1),
+      can_compose_inline(true),
+      show_ime_if_needed(false),
+      is_non_ime_change(true) {}
+
+TextInputState::TextInputState(const TextInputState& other) = default;
+
+}  //  namespace content