In Yosemite, there’s a new style. You see it in Safari and Contacts and Maps, to name three prominent examples. To save space, Apple has collapsed the two rows together into one. In Safari, the “stoplight” buttons are right next to the forward and back buttons, on the same level as the URL/search bar and all the rest of the toolbar items. This has the effect of reducing the height of the chrome on a Safari window, while also reducing the open space left to actually click on and move the window around the screen.
We can argue about whether or not this collapsed toolbar/title bar thing is a good idea. What bugs me is not that it exists, but that it only exists in a few of Apple’s apps. In Mail and Preview and TextEdit and even the new iWork apps, the old style prevails. The inconsistency rankles. If Apple thinks the tool/title bar is the future, why do many of its apps not follow the format?