Bug 1234634

Description of problem:
I was trying to browse Google+ using Epiphny (GNOME Web) and when it loaded the browser hung up and refused to scroll up or down then crashed.

This screenshot had been taken right before the crash:
http://i.imgur.com/w6Yop4i.png

Version-Release number of selected component:
epiphany-runtime-3.16.1-1.fc22

Additional info:
reporter:       libreport-2.6.0
backtrace_rating: 4
cmdline:        epiphany
crash_function: check_correctness
executable:     /usr/bin/epiphany
global_pid:     5155
kernel:         4.0.5-300.fc22.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #4 check_correctness at gtkcssstaticstyle.c:216
 #5 gtk_css_static_style_new_update at gtkcssstaticstyle.c:271
 #6 update_properties at gtkstylecontext.c:824
 #7 _gtk_style_context_validate at gtkstylecontext.c:3050
 #14 gtk_container_idle_sizer at gtkcontainer.c:1856
 #15 _g_closure_invoke_va at gclosure.c:831
 #17 g_signal_emit_by_name at gsignal.c:3401
 #18 gdk_frame_clock_paint_idle at gdkframeclockidle.c:408
 #24 g_main_context_iteration at gmain.c:3869
 #25 g_application_run at gapplication.c:2308