[Tracing] Remove AppendLongInteger in TracedValue.

JavaScript cannot represent integer larger than 2^53 - 1 from JSON, thus this
patch removes AppendLongInteger and convert long integer to string using
std::to_string.

TBR=cbruni@chromium.org

Review-Url: https://codereview.chromium.org/2557463003
Cr-Commit-Position: refs/heads/master@{#41533}

src/counters.cc

@@ -280,8 +280,8 @@ void RuntimeCallCounter::Reset() {
 
 void RuntimeCallCounter::Dump(v8::tracing::TracedValue* value) {
   value->BeginArray(name_);
-  value->AppendLongInteger(count_);
-  value->AppendLongInteger(time_.InMicroseconds());
+  value->AppendDouble(count_);
+  value->AppendDouble(time_.InMicroseconds());
   value->EndArray();
 }
 

src/tracing/traced-value.cc

@@ -121,12 +121,6 @@ void TracedValue::AppendInteger(int value) {
   data_ += std::to_string(value);
 }
 
-void TracedValue::AppendLongInteger(int64_t value) {
-  DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
-  WriteComma();
-  data_ += std::to_string(value);
-}
-
 void TracedValue::AppendDouble(double value) {
   DCHECK_CURRENT_CONTAINER_IS(kStackTypeArray);
   WriteComma();

src/tracing/traced-value.h

@@ -34,7 +34,6 @@ class TracedValue : public ConvertableToTraceFormat {
   void BeginArray(const char* name);
 
   void AppendInteger(int);
-  void AppendLongInteger(int64_t);
   void AppendDouble(double);
   void AppendBoolean(bool);
   void AppendString(const std::string&);