[iOS] Remove dependencies on //ipc from //ui/events.

ui/events/latency_info.h

 // Copyright 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 UI_EVENTS_LATENCY_INFO_H_
 #define UI_EVENTS_LATENCY_INFO_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/containers/small_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
-#include "ipc/ipc_param_traits.h"
 #include "ui/events/events_base_export.h"
 
+#if !defined(OS_IOS)
+#include "ipc/ipc_param_traits.h"  // nogncheck
+#endif
+
 namespace ui {
 
 // When adding new components, or new metrics based on LatencyInfo,
 // please update latency_info.dot.
 enum LatencyComponentType {
   // ---------------------------BEGIN COMPONENT-------------------------------
   // BEGIN COMPONENT is when we show the latency begin in chrome://tracing.
   // Timestamp when the input event is sent from RenderWidgetHost to renderer.
   INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
   // In threaded scrolling, main thread scroll listener update is async to
@@ skipping 191 matching lines @@
   uint32_t input_coordinates_size_;
   InputCoordinate input_coordinates_[kMaxInputCoordinates];
 
   // The unique id for matching the ASYNC_BEGIN/END trace event.
   int64_t trace_id_;
   // Whether this event has been coalesced into another event.
   bool coalesced_;
   // Whether a terminal component has been added.
   bool terminated_;
 
+#if !defined(OS_IOS)
   friend struct IPC::ParamTraits<ui::LatencyInfo>;
+#endif
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_LATENCY_INFO_H_