[xulrunner] Initialize RequestSyncService only if its pref is enabled

As this was merged to Gecko 47 add this as a patch. This
patch can be removed once engine reaches Gecko 47 level.

See: https://bugzilla.mozilla.org/show_bug.cgi?id=1253215

rpm/0017-Bug-1253215-Initialize-RequestSyncService-only-if-it.patch

@@ -0,0 +1,29 @@
+From d580110f44f0d24b6af62baabc44849cf63a8180 Mon Sep 17 00:00:00 2001
+From: Andrea Marchesini <amarchesini@mozilla.com>
+Date: Thu, 3 Mar 2016 18:30:16 +0100
+Subject: [PATCH 17/17] Bug 1253215 - Initialize RequestSyncService only if its
+ pref is enabled, r=ehsan
+
+Signed-off-by: Raine Makelainen <raine.makelainen@jolla.com>
+---
+ dom/requestsync/RequestSyncService.jsm | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/dom/requestsync/RequestSyncService.jsm b/dom/requestsync/RequestSyncService.jsm
+index 064912b..7fb61fe 100644
+--- a/dom/requestsync/RequestSyncService.jsm
++++ b/dom/requestsync/RequestSyncService.jsm
+@@ -76,6 +76,10 @@ this.RequestSyncService = {
+   init: function() {
+     debug("init");
+
++    if (!Services.prefs.getBoolPref("dom.requestSync.enabled")) {
++      return;
++    }
++
+     this._messages.forEach((function(msgName) {
+       ppmm.addMessageListener(msgName, this);
+     }).bind(this));
+-- 
+2.7.4
+

rpm/xulrunner-qt5.spec

@@ -58,6 +58,7 @@ Patch13:    0013-Bug-1207205-Remove-fGetActiveUniformName.-r-jrmuizel.patch
 Patch14:    0014-Revert-patchset-for-bug-1114594.-Contributes-JB32870.patch
 Patch15:    0015-Add-transition-from-pinching-to-panning.patch
 Patch16:    0016-rpm-Update-build-version.-Contributes-to-JB-35001.patch
+Patch17:    0017-Bug-1253215-Initialize-RequestSyncService-only-if-it.patch
 BuildRequires:  pkgconfig(Qt5Quick)
 BuildRequires:  pkgconfig(Qt5Network)
 BuildRequires:  pkgconfig(pango)
@@ -156,6 +157,7 @@ Tests and misc files for xulrunner.
 %patch14 -p1
 %patch15 -p1
 %patch16 -p1
+%patch17 -p1
 
 mkdir -p "%BUILD_DIR"
 cp -rf "%BASE_CONFIG" "%BUILD_DIR"/mozconfig