[Bug 39403] New: Steam 10/7/15 update: store/web no longer works

https://bugs.winehq.org/show_bug.cgi?id=39403

Bug ID: 39403
           Summary: Steam 10/7/15 update: store/web no longer works
           Product: Wine
           Version: 1.7.52
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 52515
  --> https://bugs.winehq.org/attachment.cgi?id=52515
steam log, default

Since today's Steam update any web content like the Store no longer works. As
in nothing happens, just a blank window. This is different than the win7 bug,
using the default XP here and nothing crashes. Log attached, though these lines
that appear when trying to load a page are probably the relevant bit:

fixme:advapi:CreateProcessAsUserW 0x314 L"C:\Program
Files\Steam\bin\steamwebhelper.exe" L""C:\Program
Files\Steam\bin\steamwebhelper.exe" --type=renderer
--disable-gpu-compositing --enable-pinch --lang=en-US --lang=en-US
--product-version="Valve Steam Client" --disable-spell-checking
--enable-system-flash --device-scale-factor=1 --enable-delegated-renderer
--num-raster-threads=1 -"... (nil) (nil) 0 0x0100040c (nil) (null) 0x274e2e8
0x274defc - semi-stub
[1007/185338:ERROR:child_process_launcher.cc(444)] Failed to launch child
process

Tested in wine-1.7.52 (Staging) and a fresh git pull of mainline.