[gnome-continuous] Revert "Tag libwebp"

[Emmanuele Bassi <ebassi src gnome org>]

commit 26c9200479e3ac4de54db4cc0225b7a4591b50f6
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Nov 1 11:39:47 2017 +0000

    Revert "Tag libwebp"
    
    This reverts commit cdca14c6a64157be6008ba7bad17aa46d233e603.
    
    WebKitGtk is now back to 2.18.

 manifest.json |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index 835869f..22021e9 100644
--- a/manifest.json
+++ b/manifest.json
@@ -844,9 +844,7 @@
 
                {"src": "fd:geoclue"},
       
-                {"src": "git:https://chromium.googlesource.com/webm/libwebp";,
-                 "tag": "50d1a848bc56554af8413cfe681f94286a6371b3",
-                 "tag-reason": "Last known tested version for WebKitGtk"},
+                {"src": "git:https://chromium.googlesource.com/webm/libwebp"},
 
                {"src": "git:https://github.com/hunspell/hunspell.git";,
                  "tag": "2730ad3d32d839f439ba7f286e3600cd9294a978",