revert "SourceEventType added to LatencyInfo."

ui/events/latency_info.cc

 // 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.
 
 #include "ui/events/latency_info.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 120 matching lines @@
   const unsigned char* latency_info_enabled;
 };
 
 static base::LazyInstance<LatencyInfoEnabledInitializer>::Leaky
   g_latency_info_enabled = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 namespace ui {
 
-LatencyInfo::LatencyInfo() : LatencyInfo(SourceEventType::UNKNOWN) {}
-
-LatencyInfo::LatencyInfo(SourceEventType type)
+LatencyInfo::LatencyInfo()
     : input_coordinates_size_(0),
       trace_id_(-1),
       coalesced_(false),
-      terminated_(false),
-      source_event_type_(type) {}
+      terminated_(false) {}
 
 LatencyInfo::LatencyInfo(const LatencyInfo& other) = default;
 
 LatencyInfo::~LatencyInfo() {}
 
 LatencyInfo::LatencyInfo(int64_t trace_id, bool terminated)
     : input_coordinates_size_(0),
       trace_id_(trace_id),
-      terminated_(terminated),
-      source_event_type_(SourceEventType::UNKNOWN) {}
+      terminated_(terminated) {}
 
 bool LatencyInfo::Verify(const std::vector<LatencyInfo>& latency_info,
                          const char* referring_msg) {
   if (latency_info.size() > kMaxLatencyInfoNumber) {
     LOG(ERROR) << referring_msg << ", LatencyInfo vector size "
                << latency_info.size() << " is too big.";
     TRACE_EVENT_INSTANT1("input,benchmark", "LatencyInfo::Verify Fails",
                          TRACE_EVENT_SCOPE_GLOBAL,
                          "size", latency_info.size());
     return false;
@@ skipping 203 matching lines @@
 }
 
 bool LatencyInfo::AddInputCoordinate(const gfx::PointF& input_coordinate) {
   if (input_coordinates_size_ >= kMaxInputCoordinates)
     return false;
   input_coordinates_[input_coordinates_size_++] = input_coordinate;
   return true;
 }
 
 }  // namespace ui