The User Manager's Chrome logo should flip nicely in RTL.

At the moment it stays on the right hand side, unflipped, overlapping
the other flipped buttons. >_<

BUG=NONE

Review URL: https://codereview.chromium.org/660803003

Cr-Commit-Position: refs/heads/master@{#299972}

chrome/browser/resources/user_manager/control_bar.css

@@ -88,4 +88,5 @@ html[dir=rtl] #login-header-bar #guest-user-button {
 
 html[dir=rtl] #logo {
   left: 16px;
+  right: auto;
 }