Bug 460887 - Avoid using deprecated InstanceScope() constructor

Change-Id: I05320531fdf548ffccb782306dea5b62eb0290dd
Signed-off-by: Szymon Ptaszkiewicz <szymon.ptaszkiewicz@pl.ibm.com>
diff --git a/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/resources/ProjectPreferencesTest.java b/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/resources/ProjectPreferencesTest.java
index 5b975b9..ab8cac3 100644
--- a/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/resources/ProjectPreferencesTest.java
+++ b/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/internal/resources/ProjectPreferencesTest.java
@@ -97,7 +97,7 @@
 		String instanceValue = "instance" + getUniqueString();
 		String projectValue = "project" + getUniqueString();
 		IScopeContext projectContext = new ProjectScope(project);
-		IScopeContext instanceContext = new InstanceScope();
+		IScopeContext instanceContext = InstanceScope.INSTANCE;
 		ensureExistsInWorkspace(project, true);
 
 		ArrayList<IScopeContext[]> list = new ArrayList<IScopeContext[]>();