Bug 1280177 - fix titlebar button position in devedition, r=mstange

MozReview-Commit-ID: 5lTpdW38gOL

--HG--
extra : rebase_source : 0d0fede93d77fb113f2bc6d52f3a37ffe6119162

browser/themes/osx/devedition.css

@@ -32,6 +32,16 @@
   margin-top: 6px;
 }
 
+/* In private windows, the #titlebar-content is higher because of the
+ * private browsing indicator. With the margin-top the titlebar buttons
+ * align to the top correctly in that case, but only if we don't stretch
+ * the box they're in because the container is too high, so we override
+ * the default alignment value (stretch).
+ */
+#main-window[tabsintitlebar] > #titlebar > #titlebar-content > #titlebar-buttonbox-container {
+  -moz-box-align: start;
+}
+
 /* Square back and forward buttons.  Need !important on these because there
    are a lot of more specific selectors sprinkled around elsewhere for changing
    background / shadows for different states */