Use refs for GraphicsContext

third_party/WebKit/Source/core/paint/InlinePainter.cpp

Index: third_party/WebKit/Source/core/paint/InlinePainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/InlinePainter.cpp b/third_party/WebKit/Source/core/paint/InlinePainter.cpp
index b7dfe1339f6990cdc3876f5193280e47c8f54b6f..ba1894fbfbe3d965a86c89688805c1df7c5d0bc6 100644
--- a/third_party/WebKit/Source/core/paint/InlinePainter.cpp
+++ b/third_party/WebKit/Source/core/paint/InlinePainter.cpp
@@ -21,9 +21,9 @@ namespace blink {
 
 void InlinePainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
-    if (RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled() && !paintInfo.context->paintController().skippingCache()) {
+    if (RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled() && !paintInfo.context.paintController().skippingCache()) {
         if (m_layoutInline.paintOffsetChanged(paintOffset)) {
-            paintInfo.context->paintController().invalidatePaintOffset(m_layoutInline);
+            paintInfo.context.paintController().invalidatePaintOffset(m_layoutInline);
             LineBoxListPainter(*m_layoutInline.lineBoxes()).invalidateLineBoxPaintOffsets(paintInfo);
         }
         // Set previousPaintOffset here in case that m_layoutInline paints nothing and no