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

ui/events/latency_info.h

Index: ui/events/latency_info.h
diff --git a/ui/events/latency_info.h b/ui/events/latency_info.h
index c895e627593911e23bfa2168ca8efac13ba96eb1..0001c3150ef0086f624328f5448087ecdb46ab1f 100644
--- a/ui/events/latency_info.h
+++ b/ui/events/latency_info.h
@@ -15,9 +15,12 @@
 #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,
@@ -229,7 +232,9 @@ class EVENTS_BASE_EXPORT LatencyInfo {
   // Whether a terminal component has been added.
   bool terminated_;
 
+#if !defined(OS_IOS)
   friend struct IPC::ParamTraits<ui::LatencyInfo>;
+#endif
 };
 
 }  // namespace ui