fix(CSP): update to the latest CSP api

window.SecurityPolicy is now window.securityPolicy

since this is available only in Chrome Canary which has already been
updated, we can safely make this change without worrying about
backwards compatilibty.

Closes angular#1577

Author: IgorMinar

src/ng/sniffer.js

@@ -41,7 +41,7 @@ function $SnifferProvider() {
 
         return eventSupport[event];
       },
-      csp: document.SecurityPolicy ? document.SecurityPolicy.isActive() : false
+      csp: ('securityPolicy' in document) ? document.securityPolicy.isActive : false
     };
   }];
 }

test/ng/snifferSpec.js

@@ -82,14 +82,14 @@ describe('$sniffer', function() {
 
 
   describe('csp', function() {
-    it('should be false if document.SecurityPolicy.isActive not available', function() {
+    it('should be false if document.securityPolicy.isActive not available', function() {
       expect(sniffer({}, {}).csp).toBe(false);
     });
 
 
-    it('should use document.SecurityPolicy.isActive() if available', function() {
+    it('should use document.securityPolicy.isActive if available', function() {
       var createDocumentWithCSP = function(csp) {
-        return {SecurityPolicy: {isActive: function() {return csp;}}};
+        return {securityPolicy: {isActive: csp}};
       };
 
       expect(sniffer({}, createDocumentWithCSP(false)).csp).toBe(false);