Remove dispose calls on colors in TextMergeViewer

It is not necessary anymore to call dispose on Colors since Bug 563018.

Change-Id: I630839ce1d279a8a56d1c28adf0bc1e3420ec33e
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
diff --git a/bundles/org.eclipse.compare/compare/org/eclipse/compare/contentmergeviewer/TextMergeViewer.java b/bundles/org.eclipse.compare/compare/org/eclipse/compare/contentmergeviewer/TextMergeViewer.java
index 5191a77..eb28e45 100644
--- a/bundles/org.eclipse.compare/compare/org/eclipse/compare/contentmergeviewer/TextMergeViewer.java
+++ b/bundles/org.eclipse.compare/compare/org/eclipse/compare/contentmergeviewer/TextMergeViewer.java
@@ -2009,12 +2009,6 @@
 		fRight = null;
 
 		if (fColors != null) {
-			Iterator<Color> i= fColors.values().iterator();
-			while (i.hasNext()) {
-				Color color= i.next();
-				if (!color.isDisposed())
-					color.dispose();
-			}
 			fColors= null;
 		}
 		// don't add anything here, disposing colors should be done last