Revert of Convert chart-json to Histograms.

tracing/tracing/value/diagnostics/iteration_info.html

Index: tracing/tracing/value/diagnostics/iteration_info.html
diff --git a/tracing/tracing/value/diagnostics/iteration_info.html b/tracing/tracing/value/diagnostics/iteration_info.html
index 13617b2a9377ee90f18cc6b138540c22a606151b..4bcadfa2e85a90aa285c57daffd9b15b68011409 100644
--- a/tracing/tracing/value/diagnostics/iteration_info.html
+++ b/tracing/tracing/value/diagnostics/iteration_info.html
@@ -19,7 +19,6 @@
       this.benchmarkName_ = '';
       this.benchmarkStart_ = undefined;
       this.label_ = '';
-      this.legacyTIRLabel_ = '';
       this.osVersion_ = '';
       this.productVersion_ = '';
       this.storyDisplayName_ = '';
@@ -61,9 +60,6 @@
         this.storyUrl_ = info.storyUrl;
       if (info.storysetRepeatCounter !== undefined)
         this.storysetRepeatCounter_ = info.storysetRepeatCounter;
-      if (info.legacyTIRLabel) {
-        this.legacyTIRLabel_ = info.legacyTIRLabel;
-      }
 
       // From platform tracing metadata
       if (info['os-version'])
@@ -126,14 +122,6 @@
       return this.label_;
     }
 
-    get legacyTIRLabel() {
-      return this.legacyTIRLabel_;
-    }
-
-    set legacyTIRLabel(tir) {
-      this.legacyTIRLabel_ = tir;
-    }
-
     get storyGroupingKeys() {
       return this.storyGroupingKeys_;
     }