[nwd] Patching innerHTML violations

TDD: go/trusted-types-appsheet

Change-Id: I6bb470d3cfbd1ec75e943e673ed9e2dc89a53b61

src/markerclusterer.js

diff --git a/src/markerclusterer.js b/src/markerclusterer.js
index 37f1afa..fc69cf1 100644
--- a/src/markerclusterer.js
+++ b/src/markerclusterer.js
@@ -1079,7 +1079,7 @@
   if (this.visible_) {
     var pos = this.getPosFromLatLng_(this.center_);
     this.div_.style.cssText = this.createCss(pos);
-    this.div_.innerHTML = this.sums_.text;
+    this.div_.text = this.sums_.text;
   }
 
   var panes = this.getPanes();
@@ -1178,7 +1178,7 @@
   this.text_ = sums.text;
   this.index_ = sums.index;
   if (this.div_) {
-    this.div_.innerHTML = sums.text;
+    this.div_.text = sums.text;
   }
 
   this.useStyle();