[geary] Fix some warnings showing up when compiling under Meson.

[Michael Gratton <mjog src gnome org>]

commit 473a0b88599dd66be0ba94a584562953ee992f63
Author: Michael James Gratton <mike vee net>
Date:   Tue Dec 12 15:35:23 2017 +1100

    Fix some warnings showing up when compiling under Meson.

 src/client/web-process/web-process-extension.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/client/web-process/web-process-extension.vala 
b/src/client/web-process/web-process-extension.vala
index ee89139..abd9ae4 100644
--- a/src/client/web-process/web-process-extension.vala
+++ b/src/client/web-process/web-process-extension.vala
@@ -138,8 +138,8 @@ public class GearyWebExtension : Object {
     // never actually be null.
     private JS.Value? execute_script(JS.Context context, string script, int line)
     throws Geary.JS.Error {
-        JS.String js_script = new JS.String.create_with_utf8_cstring(script);
-        JS.String js_source = new JS.String.create_with_utf8_cstring("__FILE__");
+        JS.String js_script = JS.String.create_with_utf8_cstring(script);
+        JS.String js_source = JS.String.create_with_utf8_cstring("__FILE__");
         JS.Value? err = null;
         try {
             JS.Value ret = context.evaluate_script(