[SP] Save and restore slimming paint enabled state in SP-specific unit tests.

Source/core/page/PrintContextTest.cpp

Index: Source/core/page/PrintContextTest.cpp
diff --git a/Source/core/page/PrintContextTest.cpp b/Source/core/page/PrintContextTest.cpp
index c4e0e98ccefd25dcd041b7d33133284658bd7877..619a7fa696898bda9279a82276ed0ded57c814dd 100644
--- a/Source/core/page/PrintContextTest.cpp
+++ b/Source/core/page/PrintContextTest.cpp
@@ -190,6 +190,10 @@ void PrintContextTest::testBasicLinkTarget()
 }
 
 class PrintContextTestWithSlimmingPaint : public PrintContextTest {
+public:
+    PrintContextTestWithSlimmingPaint()
+        : m_originalSlimmingPaintEnabled(RuntimeEnabledFeatures::slimmingPaintEnabled()) { }
+
 protected:
     virtual void SetUp() override
     {
@@ -198,9 +202,12 @@ protected:
     }
     virtual void TearDown() override
     {
-        RuntimeEnabledFeatures::setSlimmingPaintEnabled(false);
+        RuntimeEnabledFeatures::setSlimmingPaintEnabled(m_originalSlimmingPaintEnabled);
         PrintContextTest::TearDown();
     }
+
+private:
+    bool m_originalSlimmingPaintEnabled;
 };
 
 TEST_F(PrintContextTest, LinkTarget)