Ubuntu – The title bar buttons for “chrome” are different than usual applications(according to theme)

Chrome draws its own buttons rather than letting the OS do it. There is a setting that allows it to use native window titlebars, but this isn't the most elegant solution to the problem because you lose the benefit (when windowed) of Chrome not having extra space for the titlebar.

Chrome guesses which side to put the buttons on based on various Gnome-related settings, but this doesn't always work properly with Ubuntu's Unity interface.

This article tells how to move them to the desired side. Note that if you sometimes use Gnome-shell rather than Unity, this has the potential to affect how all title bars appear in your Gnome-shell sessions.

To quote:

To move window buttons of Google Chrome to the right under Ubuntu 12.10 or older, open the terminal and issue this command:

gconftool-2 --set /apps/metacity/general/button_layout --type string ":minimize,maximize,close"

First you will need to find a theme with the buttons you want and install that theme.

You can find many OS X themes at gnome-look, search gtk3 theme in the type and osx in the description, though I will recommend you, based on your question, this nice flat Yosemite theme (Developers screenshot).

This should look really nice with the Arc theme, in my opinion.

Next install

sudo apt-get install gnome-tweak-tool

When it is finished start this app from the launcher or

gnome-tweak-tool

Browse to the Appearance section and you will see this

Change the window theme to change your window declarations and gtk3 for the rest of the theme.