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 1ee72ecaef001a786c077b6cf159c785ca667a1d..a23463fb9f664acbe821b9e6c54628132bb08ff7 100644
--- a/ui/latency/ipc/latency_info_param_traits_unittest.cc
+++ b/ui/latency/ipc/latency_info_param_traits_unittest.cc
@@ -17,10 +17,10 @@ TEST(LatencyInfoParamTraitsTest, Basic) {
   LatencyInfo latency;
   latency.set_trace_id(5);
   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(5, latency.trace_id());
   EXPECT_TRUE(latency.terminated());
@@ -42,7 +42,6 @@ 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(