providing standard platform check utility

Fixup : Address review comments

Author: srinibharath

bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/FocusCellOwnerDrawHighlighter.java

@@ -17,6 +17,7 @@
 package org.eclipse.jface.viewers;
 
 import org.eclipse.core.runtime.Assert;
+import org.eclipse.jface.util.Util;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.GC;
@@ -106,7 +107,7 @@ private void markFocusedCell(Event event, ViewerCell cell) {
 
 	private void removeSelectionInformation(Event event, ViewerCell cell) {
 		GC gc = event.gc;
-		if ("gtk".equals(SWT.getPlatform())) { //$NON-NLS-1$
+		if (Util.isGtk()) {
 			// On GTK, the line is highlighted even though the SELECTED flag is removed. To
 			// fix this issue, the background must be overwridden
 			gc.setBackground(cell.getViewerRow().getBackground(cell.getColumnIndex()));

bundles/org.eclipse.search/search/org/eclipse/search/internal/ui/text/FileLabelProvider.java

@@ -19,11 +19,11 @@
 import java.util.Arrays;
 import java.util.Comparator;
 
-import org.eclipse.swt.SWT;
 import org.eclipse.swt.graphics.Image;
 
 import org.eclipse.core.resources.IResource;
 
+import org.eclipse.jface.util.Util;
 import org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.IStyledLabelProvider;
 import org.eclipse.jface.viewers.ILabelProviderListener;
 import org.eclipse.jface.viewers.LabelProvider;
@@ -186,7 +186,7 @@ private int appendShortenedGap(String content, int start, int end, int charsToCu
 
 
 	private int getCharsToCut(int contentLength, Match[] matches) {
-		if (contentLength <= 256 || !"win32".equals(SWT.getPlatform()) || matches.length == 0) { //$NON-NLS-1$
+		if (contentLength <= 256 || !Util.isWin32() || matches.length == 0) {
 			return 0; // no shortening required
 		}
 		// XXX: workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=38519