trace2: remove adddots method

In Git, dots are only used on nested region messages, which are currently
not supported in GCM. Remove the AddDots() method that is used incorrectly
for formatting child process messages.

Author: ldennington

src/shared/Core/Trace2Message.cs

@@ -83,16 +83,6 @@ protected string BuildPerformanceString()
 
     protected abstract string GetEventMessage(Trace2FormatTarget formatTarget);
 
-    protected void AddDots(StringBuilder sb)
-    {
-        var dotCount = Depth;
-        while (dotCount > 0)
-        {
-            sb.Append("..");
-            dotCount--;
-        }
-    }
-
     internal static string BuildTimeSpan(double time)
     {
         var timeString = time.ToString("F6");
@@ -304,7 +294,6 @@ protected override string BuildPerformanceSpan()
     protected override string GetEventMessage(Trace2FormatTarget formatTarget)
     {
         var sb = new StringBuilder();
-        AddDots(sb);
 
         if (formatTarget == Trace2FormatTarget.Performance)
             sb.Append($"[ch{Id}]");
@@ -359,7 +348,6 @@ protected override string BuildPerformanceSpan()
     protected override string GetEventMessage(Trace2FormatTarget formatTarget)
     {
         var sb = new StringBuilder();
-        AddDots(sb);
 
         if (formatTarget == Trace2FormatTarget.Performance)
             sb.Append($"[ch{Id}]");