<webview>: navigating to WebStore should fire a loadabort instead of crashing.

chrome/test/data/extensions/platform_apps/web_view/shim/inject_comm_channel.js

Index: chrome/test/data/extensions/platform_apps/web_view/shim/inject_comm_channel.js
diff --git a/chrome/test/data/extensions/platform_apps/web_view/shim/inject_comm_channel.js b/chrome/test/data/extensions/platform_apps/web_view/shim/inject_comm_channel.js
index c5cc2d5ee03f915c8069d180eeab4982cd24ac0f..0566638de306dcb2717d5c57f14e0c3e982e2ed1 100644
--- a/chrome/test/data/extensions/platform_apps/web_view/shim/inject_comm_channel.js
+++ b/chrome/test/data/extensions/platform_apps/web_view/shim/inject_comm_channel.js
@@ -2,21 +2,32 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var embedder = null;
+var embedder = {};
+// This will be overriden in specific tests.
+embedder.processMessage = function(data) {
+  return false;
+};
 
 function reportConnected() {
   var msg = ['connected'];
-  embedder.postMessage(JSON.stringify(msg), '*');
+  embedder.channel.postMessage(JSON.stringify(msg), '*');
+}
+
+function reportError(messageType) {
+  var msg = ['error', messageType];
+  embedder.channel.postMessage(JSON.stringify(msg), '*');
 }
 
 window.addEventListener('message', function(e) {
-  embedder = e.source;
+  embedder.channel = e.source;
   var data = JSON.parse(e.data);
-  switch (data[0]) {
-    case 'connect': {
-      reportConnected();
-      break;
-    }
+  if (data[0] == 'connect') {
+    reportConnected();
+    return;
+  }
+  if (!embedder.processMessage(data)) {
+    reportError(data[0]);
+    return;
   }
 });