Oilpan: fix build after r194270.

Source/core/editing/VisibleSelectionTest.cpp

Index: Source/core/editing/VisibleSelectionTest.cpp
diff --git a/Source/core/editing/VisibleSelectionTest.cpp b/Source/core/editing/VisibleSelectionTest.cpp
index c14924b20b9f007b333227ed9b5fd4c9c881533c..b8bada86806a4a71b45f0b78de361eb373afcd49 100644
--- a/Source/core/editing/VisibleSelectionTest.cpp
+++ b/Source/core/editing/VisibleSelectionTest.cpp
@@ -99,6 +99,9 @@ TEST_F(VisibleSelectionTest, ShadowCrossing)
     RefPtrWillBeRawPtr<Element> two = body->querySelector("#two", ASSERT_NO_EXCEPTION);
     RefPtrWillBeRawPtr<Element> six = shadowRoot->querySelector("#s6", ASSERT_NO_EXCEPTION);
 
+    ASSERT_UNUSED(two, two);
+    (void)six;
+
     VisibleSelection selection(Position::firstPositionInNode(one.get()), Position::lastPositionInNode(shadowRoot.get()));
 
     EXPECT_EQ(Position(host.get(), Position::PositionIsBeforeAnchor), selection.start());
@@ -118,6 +121,9 @@ TEST_F(VisibleSelectionTest, ShadowDistributedNodes)
     RefPtrWillBeRawPtr<Element> two = body->querySelector("#two", ASSERT_NO_EXCEPTION);
     RefPtrWillBeRawPtr<Element> five = shadowRoot->querySelector("#s5", ASSERT_NO_EXCEPTION);
 
+    ASSERT_UNUSED(host, host);
+    ASSERT_UNUSED(five, five);
+
     VisibleSelection selection(Position::firstPositionInNode(one.get()), Position::lastPositionInNode(two.get()));
 
     EXPECT_EQ(Position(one->firstChild(), 0, Position::PositionIsOffsetInAnchor), selection.start());
@@ -140,6 +146,10 @@ TEST_F(VisibleSelectionTest, ShadowNested)
     RefPtrWillBeRawPtr<Element> host2 = shadowRoot->querySelector("#host2", ASSERT_NO_EXCEPTION);
     RefPtrWillBeRawPtr<Element> eight = shadowRoot2->querySelector("#s8", ASSERT_NO_EXCEPTION);
 
+    ASSERT_UNUSED(two, two);
+    ASSERT_UNUSED(eight, eight);
+    (void)host2;
+
     VisibleSelection selection(Position::firstPositionInNode(one.get()), Position::lastPositionInNode(shadowRoot2.get()));
 
     EXPECT_EQ(Position(host.get(), Position::PositionIsBeforeAnchor), selection.start());