[gnome-continuous] Revert "Bump up WebKitGTK to 2.19.2"

[Emmanuele Bassi <ebassi src gnome org>]

commit 62ce9f168df1b92036eff83768f48d2b3277fd5c
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Nov 28 00:21:27 2017 +0000

    Revert "Bump up WebKitGTK to 2.19.2"
    
    This reverts commit d84eb2e3154eedd5af67023994020c82c2fcf20b.
    
    Nope, still can't find whatever it is that it's looking for in libwebp.

 manifest.json |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 89d9e1d..1df294e 100644
--- a/manifest.json
+++ b/manifest.json
@@ -855,9 +855,9 @@
                 "name": "enchant",
                 "checksum": "2fac9e7be7e9424b2c5570d8affe568db39f7572c10ed48d4e13cddf03f7097f"},
 
-               {"src": "tarball:https://www.webkitgtk.org/releases/webkitgtk-2.19.2.tar.xz";,
+               {"src": "tarball:http://www.webkitgtk.org/releases/webkitgtk-2.18.2.tar.xz";,
                 "name": "webkitgtk",
-                "checksum": "439e88894accd4849d218b29a0755d25aa6c79224fc700206c860108d223d4c3",
+                "checksum": "b14cb3f1b5321b1dc50abcc0445a97f8e2f8813562bca7ce4d2f8069f6fec8e7",
                 "patches": ["webkitgtk-cmake-buildapi.patch"]},
 
                {"src": "gnome:libgee",