fix($browser): .url() should always return self in setter mode

src/ng/browser.js

@@ -170,7 +170,7 @@ function Browser(window, document, $log, $sniffer) {
       // IE<10 from getting into redirect loop when in LocationHashbangInHtml5Url mode.
       // See https://github.com/angular/angular.js/commit/ffb2701
       if (lastBrowserUrl === url && (!$sniffer.history || sameState)) {
-        return;
+        return self;
       }
       var sameBase = lastBrowserUrl && stripHash(lastBrowserUrl) === stripHash(url);
       lastBrowserUrl = url;

test/ng/browserSpecs.js

@@ -576,6 +576,12 @@ describe('browser', function() {
       expect(browser.url('http://any.com')).toBe(browser);
     });
 
+    it('should return $browser to allow chaining even if the previous and current URLs and states match', function() {
+      expect(browser.url('http://any.com').url('http://any.com')).toBe(browser);
+      var state = { any: 'foo' };
+      expect(browser.url('http://any.com', false, state).url('http://any.com', false, state)).toBe(browser);
+      expect(browser.url('http://any.com', true, state).url('http://any.com', true, state)).toBe(browser);
+    });
 
     it('should decode single quotes to work around FF bug 407273', function() {
       fakeWindow.location.href = "http://ff-bug/?single%27quote";