Clear button doesn't clear everything in memory section.

Source/devtools/front_end/MemoryStatistics.js

Index: Source/devtools/front_end/MemoryStatistics.js
diff --git a/Source/devtools/front_end/MemoryStatistics.js b/Source/devtools/front_end/MemoryStatistics.js
index ad026fab897cb98d4977c91f78f0855da80b70ff..64ee78be4d2031ebb3c6cc4d424f0acb661e7a2c 100644
--- a/Source/devtools/front_end/MemoryStatistics.js
+++ b/Source/devtools/front_end/MemoryStatistics.js
@@ -267,6 +267,10 @@ WebInspector.MemoryStatistics.prototype = {
     {
         for (var i = 0; i < this._counters.length; ++i)
             this._counters[i].reset();
+
+        for (var i = 0; i < this._counterUI.length; ++i)
+            this._counterUI[i].reset();
+
         this.refresh();
     },