Correct task items' icon position in RTL languages.

Correct task items' layout for RTL languages.

This CL fixes task items' layout problem in action button (as combobutton) and default task (in context menu).
In the screenshot attached in issue 371232, these problems are pointed as "Icon position of task menu is strange.". 
For margin and padding, I used -webkit-margin-start etc..
For background position, I used separate selector for html in 'rtl'.  

BUG=371232
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269546

[fukino, 2014-05-09 05:29:24]

hirono san, could you take a look?

[hirono, 2014-05-09 05:46:35]

lgtm with two nits. Thank you!

https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
File ui/file_manager/file_manager/foreground/css/combobutton.css (right):

https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
ui/file_manager/file_manager/foreground/css/combobutton.css:14:
-webkit-padding-start: 21px;
-webkit-xxx should be placed above the normal styles.

https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
ui/file_manager/file_manager/foreground/css/combobutton.css:24:
-webkit-margin-end: -8px;
Please sort -webkit-margin-end and -webkit-margin-start by their property names.

[fukino, 2014-05-09 05:54:30]

Sorted selectors.
Thank you very much!

https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
File ui/file_manager/file_manager/foreground/css/combobutton.css (right):

https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
ui/file_manager/file_manager/foreground/css/combobutton.css:14:
-webkit-padding-start: 21px;
On 2014/05/09 05:46:35, hirono wrote:
> -webkit-xxx should be placed above the normal styles.

Done.

https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
ui/file_manager/file_manager/foreground/css/combobutton.css:24:
-webkit-margin-end: -8px;
On 2014/05/09 05:46:35, hirono wrote:
> Please sort -webkit-margin-end and -webkit-margin-start by their property
names.

Done.

[fukino, 2014-05-09 05:57:42]

On 2014/05/09 05:54:30, fukino wrote:
> Sorted selectors.
> Thank you very much!
> 
>
https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
> File ui/file_manager/file_manager/foreground/css/combobutton.css (right):
> 
>
https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
> ui/file_manager/file_manager/foreground/css/combobutton.css:14:
> -webkit-padding-start: 21px;
> On 2014/05/09 05:46:35, hirono wrote:
> > -webkit-xxx should be placed above the normal styles.
> 
> Done.
> 
>
https://codereview.chromium.org/278793002/diff/20001/ui/file_manager/file_man...
> ui/file_manager/file_manager/foreground/css/combobutton.css:24:
> -webkit-margin-end: -8px;
> On 2014/05/09 05:46:35, hirono wrote:
> > Please sort -webkit-margin-end and -webkit-margin-start by their property
> names.
> 
> Done.

Oops, not selectors, but properties.

[fukino, 2014-05-09 05:58:37]

The CQ bit was checked by fukino@chromium.org

[commit-bot: I haz the power, 2014-05-09 06:02:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/fukino@chromium.org/278793002/40001

[commit-bot: I haz the power, 2014-05-10 06:30:44]

Change committed as 269546