Don't double-escape in strings in the VM Service, and don't use \u0000 to determine the string lengt

runtime/bin/vmservice/observatory/lib/src/elements/instance_ref.html

Index: runtime/bin/vmservice/observatory/lib/src/elements/instance_ref.html
diff --git a/runtime/bin/vmservice/observatory/lib/src/elements/instance_ref.html b/runtime/bin/vmservice/observatory/lib/src/elements/instance_ref.html
index 1c8747e12d6f0dcc208f6a95d38c39345538880b..ab7bb160b53bed5b80bcd440e869a61d1bf6d404 100644
--- a/runtime/bin/vmservice/observatory/lib/src/elements/instance_ref.html
+++ b/runtime/bin/vmservice/observatory/lib/src/elements/instance_ref.html
@@ -22,11 +22,16 @@
         <div title="{{ hoverText }}">{{ ref.valueAsString }}</div>
       </template>
 
-      <template if="{{ ref.isString || ref.isBool || ref.isInt ||
+      <template if="{{ ref.isBool || ref.isInt ||
                        ref.isDouble || ref.isNull }}">
         <a on-click="{{ goto }}" _href="{{ url }}">{{ ref.valueAsString }}</a>
       </template>
 
+      <template if="{{ ref.isString }}">
+        <a on-click="{{ goto }}" _href="{{ url }}">{{ asStringLiteral(ref.valueAsString, ref.valueAsStringIsTruncated) }}</a>
+      </template>
+
+
       <template if="{{ ref.isAbstractType }}">
         <a on-click="{{ goto }}" _href="{{ url }}">{{ ref.name }}</a>
       </template>