Use a proper closure instead of a 'close your eyes' style closure

for setting up '_printClosure'.

This avoid the startup cost of looking up types 'window', 'console'
and 'HTMLDocument' types when we try to setup _printClosure.
On a nexus 4 device the change results in the following time changes:

Before the change:
I/Dartium (25903):     createIsolate before printClosure setting 155.318 ms
I/Dartium (25903):     createIsolate after printClosure setting 403.052 ms


After the Change:
I/Dartium (26537):     createIsolate before printClosure setting 157.058 ms
I/Dartium (26537):     createIsolate after printClosure setting 162.918 ms

R=rmacnak@google.com, vsm@google.com

Review URL: https://codereview.chromium.org//312653004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@36943 260f80e4-7a28-3924-810f-c04153c831b5

sdk/lib/html/dartium/html_dartium.dart

@@ -37982,7 +37982,7 @@ class _DOMStringMap extends NativeFieldWrapperClass2 implements Map<String, Stri
   }
 }
 
-final _printClosure = window.console.log;
+final _printClosure = (s) => window.console.log(s);
 final _pureIsolatePrintClosure = (s) {
   throw new UnimplementedError("Printing from a background isolate "
                                "is not supported in the browser");

tools/dom/src/html_native_DOMImplementation.dart

@@ -512,7 +512,7 @@ class _DOMStringMap extends NativeFieldWrapperClass2 implements Map<String, Stri
   }
 }
 
-final _printClosure = window.console.log;
+final _printClosure = (s) => window.console.log(s);
 final _pureIsolatePrintClosure = (s) {
   throw new UnimplementedError("Printing from a background isolate "
                                "is not supported in the browser");

tools/dom/src/native_DOMImplementation.dart

@@ -499,7 +499,7 @@ class _DOMStringMap extends NativeFieldWrapperClass2 implements Map<String, Stri
   }
 }
 
-final _printClosure = window.console.log;
+final _printClosure = (s) => window.console.log(s);
 final _pureIsolatePrintClosure = (s) {
   throw new UnimplementedError("Printing from a background isolate "
                                "is not supported in the browser");