Custom DPI setting is not taken into account in showing web pages

After I change DPI setting in Xfce's in the Fonts tab of Appearance setting dialog, and start chromium-browser, text size in web pages are not changed. This is different than what google-chrome Version 48.0.2564.82 (64-bit) does.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: chromium-browser 48.0.2564.82-0ubuntu0.15.10.1.1219
ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
Uname: Linux 4.2.0-25-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Jan 26 20:37:41 2016
Desktop-Session:
 'xubuntu'
 '/etc/xdg/xdg-xubuntu:/usr/share/upstart/xdg:/etc/xdg:/etc/xdg'
 '/usr/share/xubuntu:/usr/share/xfce4:/usr/local/share/:/usr/share/:/usr/share'
DetectedPlugins:

EcryptfsInUse: Yes
Env:
 'None'
 'None'
InstallationDate: Installed on 2015-11-21 (65 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
Load-Avg-1min: 0.99
Load-Processes-Running-Percent: 0.6%
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-25-generic root=UUID=bdc3be24-dee9-4ead-bca0-c9b1e45a87e5 ro persistent quiet splash
SourcePackage: chromium-browser
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68MVD Ver. F.20
dmi.board.name: 30C5
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.36
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68MVDVer.F.20:bd12/01/2011:svnHewlett-Packard:pn:pvrF.20:rvnHewlett-Packard:rn30C5:rvrKBCVersion71.36:cvnHewlett-Packard:ct10:cvr:
dmi.product.version: F.20
dmi.sys.vendor: Hewlett-Packard
gconf-keys: /desktop/gnome/applications/browser/exec = b''/desktop/gnome/url-handlers/https/command = b''/desktop/gnome/url-handlers/https/enabled = b''/desktop/gnome/url-handlers/http/command = b''/desktop/gnome/url-handlers/http/enabled = b''/desktop/gnome/session/required_components/windowmanager = b''/apps/metacity/general/compositing_manager = b''/desktop/gnome/interface/icon_theme = b''/desktop/gnome/interface/gtk_theme = b''
modified.conffile..etc.default.chromium.browser: [deleted]