Remove LatencyInfo::sequence_number. (May break metrics).

ui/latency/ipc/latency_info_param_traits_unittest.cc

Index: ui/latency/ipc/latency_info_param_traits_unittest.cc
diff --git a/ui/latency/ipc/latency_info_param_traits_unittest.cc b/ui/latency/ipc/latency_info_param_traits_unittest.cc
index b41a10ad8c66ab323f3fc3ade730a73b65b070db..84400cc14549d26f54eefac40a16948fba557495 100644
--- a/ui/latency/ipc/latency_info_param_traits_unittest.cc
+++ b/ui/latency/ipc/latency_info_param_traits_unittest.cc
@@ -16,12 +16,11 @@ namespace ui {
 TEST(LatencyInfoParamTraitsTest, Basic) {
   LatencyInfo latency;
   ASSERT_FALSE(latency.terminated());
-  latency.AddLatencyNumber(INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT, 1234, 0);
-  latency.AddLatencyNumber(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 1234, 100);
+  latency.AddLatencyNumber(INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT, 1234);
+  latency.AddLatencyNumber(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 1234);
   latency.AddLatencyNumber(INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT,
-                           1234, 0);
+                           1234);
 
-  EXPECT_EQ(100, latency.trace_id());
   EXPECT_TRUE(latency.terminated());
 
   IPC::Message msg(1, 2, IPC::Message::PRIORITY_NORMAL);
@@ -41,7 +40,6 @@ TEST(LatencyInfoParamTraitsTest, Basic) {
   EXPECT_TRUE(output.FindLatency(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT,
                                  1234,
                                  &rwh_comp));
-  EXPECT_EQ(100, rwh_comp.sequence_number);
   EXPECT_EQ(1u, rwh_comp.event_count);
 
   EXPECT_TRUE(output.FindLatency(