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

runtime/bin/vmservice/observatory/deployed/web/index_devtools.html

Index: runtime/bin/vmservice/observatory/deployed/web/index_devtools.html
diff --git a/runtime/bin/vmservice/observatory/deployed/web/index_devtools.html b/runtime/bin/vmservice/observatory/deployed/web/index_devtools.html
index 06ea44e61003e5cbb182b660a11df58d1ab62acd..afb894c4bec91b72d559263c13bc873dfe8c5b74 100644
--- a/runtime/bin/vmservice/observatory/deployed/web/index_devtools.html
+++ b/runtime/bin/vmservice/observatory/deployed/web/index_devtools.html
@@ -925,11 +925,16 @@ hr {
         <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>
@@ -15497,6 +15502,13 @@ hr {
             </div>
           </template>
 
+          <template if="{{ instance.isString }}">
+            <div class="memberItem">
+              <div class="memberName">valueAsLiteral</div>
+              <div class="memberValue"> {{ asStringLiteral(instance.valueAsString, instance.valueAsStringIsTruncated) }}</div>
+            </div>
+          </template>
+
           <template if="{{ instance.isMirrorReference }}">
             <div class="memberItem">
               <div class="memberName">referent</div>