Note to replace both default and active states 

folder_icon.png
folder_icon_active

Thanks :)

Also, FYI, we don't actually need the "active" versions of the folder icon anymore; we now generate them at runtime by tinting the regular version blue. Same goes for all the other "active" icons in that folder. Hopefully, that can save you work in the future :)

Oh that's right! Thanks for the reminder! 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c9ab6d00ab2eae4cf7f1c86a39671b679326151b

commit c9ab6d00ab2eae4cf7f1c86a39671b679326151b
Author: newt <newt@chromium.org>
Date: Mon Mar 28 18:51:05 2016

Update bookmark folder icon.

BUG= 598087 

Review URL: https://codereview.chromium.org/1837503004

Cr-Commit-Position: refs/heads/master@{#383530}

[modify] https://crrev.com/c9ab6d00ab2eae4cf7f1c86a39671b679326151b/chrome/android/java/res/drawable-hdpi/bookmark_folder.png
[modify] https://crrev.com/c9ab6d00ab2eae4cf7f1c86a39671b679326151b/chrome/android/java/res/drawable-mdpi/bookmark_folder.png
[modify] https://crrev.com/c9ab6d00ab2eae4cf7f1c86a39671b679326151b/chrome/android/java/res/drawable-xhdpi/bookmark_folder.png
[modify] https://crrev.com/c9ab6d00ab2eae4cf7f1c86a39671b679326151b/chrome/android/java/res/drawable-xxhdpi/bookmark_folder.png
[modify] https://crrev.com/c9ab6d00ab2eae4cf7f1c86a39671b679326151b/chrome/android/java/res/drawable-xxxhdpi/bookmark_folder.png