[epiphany] Revert "Try reenabling on-demand hardware acceleration"

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c507f5faa1f8b7eefd218de40f7643280de5b6fa
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Sep 30 07:55:22 2019 -0500

    Revert "Try reenabling on-demand hardware acceleration"
    
    This reverts commit 2b0064cfb7ca25212b7445a55adbe8248ba4373d.
    
    It's a sporadic failure, but sufficiently-frequent to be problematic and
    definitely AC mode to blame. This is a blocker.

 data/org.gnome.epiphany.gschema.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/org.gnome.epiphany.gschema.xml b/data/org.gnome.epiphany.gschema.xml
index eda2f7e1a..e32d33167 100644
--- a/data/org.gnome.epiphany.gschema.xml
+++ b/data/org.gnome.epiphany.gschema.xml
@@ -244,7 +244,7 @@
                        <description>Keep track of last download directory</description>
                </key>
                <key name="hardware-acceleration-policy" 
enum="org.gnome.Epiphany.EphyPrefsWebHardwareAccelerationPolicy">
-                       <default>'on-demand'</default>
+                       <default>'never'</default>
                        <summary>Hardware acceleration policy</summary>
                        <description>Whether to enable hardware acceleration. Possible values are 
“on-demand”, “always”, and “never”. Hardware acceleration may be required to achieve acceptable performance 
on embedded devices, but increases memory usage requirements and could expose severe hardware-specific 
graphics driver bugs. When the policy is “on-demand”, hardware acceleration will be used only when required 
to display 3D transforms.</description>
                </key>