Revert "Added isolate + thread high watermark tracking to Observatory"

runtime/observatory/lib/src/elements/isolate_view.dart

Index: runtime/observatory/lib/src/elements/isolate_view.dart
diff --git a/runtime/observatory/lib/src/elements/isolate_view.dart b/runtime/observatory/lib/src/elements/isolate_view.dart
index 3d088d69bdfc58025437c644366e7db6224e1f8f..ef157c09efa87c68edca2330885f7d294d5006ef 100644
--- a/runtime/observatory/lib/src/elements/isolate_view.dart
+++ b/runtime/observatory/lib/src/elements/isolate_view.dart
@@ -277,17 +277,6 @@ class IsolateViewElement extends HtmlElement implements Renderable {
                         ..text = 'object store'
                     ]
                 ],
-              new DivElement()
-                ..classes = ['memberItem']
-                ..children = [
-                  new DivElement()
-                    ..classes = ['memberName']
-                    ..text = 'high watermark',
-                  new DivElement()
-                    ..classes = ['memberValue']
-                    ..text = Utils.formatSize(_isolate.memoryHighWatermark)
-                    ..title = '${_isolate.memoryHighWatermark}B'
-                ],
               new BRElement(),
               new DivElement()
                 ..classes = ['memberItem']
@@ -354,11 +343,6 @@ class IsolateViewElement extends HtmlElement implements Renderable {
               ..classes = ['indent']
               ..text = 'kind ${t.kindString}',
             new DivElement()
-              ..classes = ['indent']
-              ..title = '${t.memoryHighWatermark}B'
-              ..text =
-              'high watermark ${Utils.formatSize(t.memoryHighWatermark)}',
-            new DivElement()
               ..children = t.zones
                 .map((z) => new DivElement()
                 ..classes = ['indent']