[gnome-calculator] number: Use proper chain-up syntax

[Robert Roth <robertroth src gnome org>]

commit 343f9cb054af996e06d676996e083bc2dc9679d6
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Dec 4 11:53:19 2016 +0100

    number: Use proper chain-up syntax
    
    https://bugzilla.gnome.org/show_bug.cgi?id=775596

 lib/number.vala |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/lib/number.vala b/lib/number.vala
index 49e8af2..cc364a1 100644
--- a/lib/number.vala
+++ b/lib/number.vala
@@ -67,7 +67,7 @@ public class Number : Object
             denominator = -denominator;
         }
 
-        Number.integer (numerator);
+        this.integer (numerator);
         if (denominator != 1)
         {
             num.divide_unsigned_integer (num, (long) denominator);
@@ -94,7 +94,7 @@ public class Number : Object
     {
         var x = theta.cos (unit);
         var y = theta.sin (unit);
-        Number.complex (x.multiply (r), y.multiply (r));
+        this.complex (x.multiply (r), y.multiply (r));
     }
 
     public Number.eulers ()
@@ -119,7 +119,7 @@ public class Number : Object
     /* Sets z to be a uniform random number in the range [0, 1] */
     public Number.random ()
     {
-        Number.double (Random.next_double ());
+        this.double (Random.next_double ());
     }
 
     public int64 to_integer ()