DevTools: [Persistence] validate persistence binding.

third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html

Index: third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html b/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html
index a201ed2d6014e9eb282a7d391de58e43833b2ba8..aa8c1861304d4fb977dd694f443f29e212f25508 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-do-not-bind-dirty-sourcecode.html
@@ -26,14 +26,14 @@ function test()
 
         function addFileSystemMapping(next)
         {
+            InspectorTest.addSniffer(Persistence.Persistence.prototype, '_prevalidationFailedForTest', onPrevalidationFailed);
             Workspace.fileSystemMapping.addFileMapping(fs.fileSystemPath, "http://127.0.0.1:8000", "/");
-            next();
-        },
 
-        function dumpConsoleMessages(next)
-        {
-            InspectorTest.dumpConsoleMessages();
-            next();
+            function onPrevalidationFailed(binding)
+            {
+                InspectorTest.addResult("Failed to create binding: " + binding);
+                next();
+            }
         },
     ]);
 };