"Reverting 30387" -- failures on IE

pkg/polymer/lib/src/build/linter.dart

Index: pkg/polymer/lib/src/build/linter.dart
diff --git a/pkg/polymer/lib/src/build/linter.dart b/pkg/polymer/lib/src/build/linter.dart
index 3c5fa20d3aff6ceba0af6e67acfa860ff9becff4..f186d310191507ed4561d7825fb29d3b50faafa9 100644
--- a/pkg/polymer/lib/src/build/linter.dart
+++ b/pkg/polymer/lib/src/build/linter.dart
@@ -254,6 +254,11 @@ class _LinterVisitor extends TreeVisitor {
     if (_isEntrypoint && !_dartTagSeen) {
       _logger.error(USE_INIT_DART, span: doc.body.sourceSpan);
     }
+
+    if (_isEntrypoint && !_dartJSSeen) {
+      // TODO(sigmund): remove this when webkitStartDart is gone.
+      _logger.error(USE_DART_JS, span: doc.body.sourceSpan);
+    }
   }
 
   /** Produce warnings for invalid link-rel tags. */
@@ -491,6 +496,15 @@ class _LinterVisitor extends TreeVisitor {
           span: node.attributeSpans[name]);
     }
 
+    var eventName = name.substring('on-'.length);
+    if (eventName.contains('-')) {
+      var newEvent = toCamelCase(eventName);
+      _logger.warning('Invalid event name "$name". After the "on-" the event '
+          'name should not use dashes. For example use "on-$newEvent" or '
+          '"on-${newEvent.toLowerCase()}" (both forms are equivalent in HTML).',
+          span: node.attributeSpans[name]);
+    }
+
     if (value.contains('.') || value.contains('(')) {
       _logger.warning('Invalid event handler body "$value". Declare a method '
           'in your custom element "void handlerName(event, detail, target)" '
@@ -528,12 +542,16 @@ const String _MAGENTA_COLOR = '\u001b[35m';
 const String _NO_COLOR = '\u001b[0m';
 
 const String USE_INIT_DART =
-    'To run a polymer application, you need to call "initPolymer". You can '
+    'To run a polymer applications, you need to call "initPolymer". You can '
     'either include a generic script tag that does this for you:'
     '\'<script type="application/dart">export "package:polymer/init.dart";'
     '</script>\' or add your own script tag and call that function. '
     'Make sure the script tag is placed after all HTML imports.';
 
+const String USE_DART_JS =
+    'To run a polymer applications in Dartium, make sure to include'
+    '\'<script src="packages/browser/dart.js"></script>\' in your page';
+
 const String BOOT_JS_DEPRECATED =
     '"boot.js" is now deprecated. Instead, you can initialize your polymer '
     'application by calling "initPolymer()" in your main. If you don\'t have a '