Remove gpu side LatencyInfo merging

ui/events/latency_info.cc

Index: ui/events/latency_info.cc
diff --git a/ui/events/latency_info.cc b/ui/events/latency_info.cc
index a3a11828db041ee90e844c9076a4d3bd70fb24e3..dd5e11c3141899d3a1350a6def8fc30950b4a281 100644
--- a/ui/events/latency_info.cc
+++ b/ui/events/latency_info.cc
@@ -11,6 +11,9 @@
 #include <algorithm>
 
 namespace {
+
+const unsigned int kMaxLatencyInfoNumber = 100;
+
 const char* GetComponentName(ui::LatencyComponentType type) {
 #define CASE_TYPE(t) case ui::t:  return #t
   switch (type) {
@@ -119,6 +122,16 @@ LatencyInfo::LatencyInfo() : trace_id(-1), terminated(false) {
 LatencyInfo::~LatencyInfo() {
 }
 
+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.";
+    return false;
+  }
+  return true;
+}
+
 void LatencyInfo::MergeWith(const LatencyInfo& other) {
   for (LatencyMap::const_iterator it = other.latency_components.begin();
        it != other.latency_components.end();