Replaced PassRefPtr copies with moves in Source/core.

third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp

Index: third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp b/third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp
index 6c8312341c8a4a436877606c382e14568a7687e5..5990f80725ec39b791e92c42f6420ab240c74a21 100644
--- a/third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutFullScreen.cpp
@@ -200,13 +200,13 @@ void LayoutFullScreen::createPlaceholder(PassRefPtr<ComputedStyle> style, const
 
     if (!m_placeholder) {
         m_placeholder = new LayoutFullScreenPlaceholder(this);
-        m_placeholder->setStyleWithWritingModeOfParent(style);
+        m_placeholder->setStyleWithWritingModeOfParent(std::move(style));
         if (parent()) {
             parent()->addChildWithWritingModeOfParent(m_placeholder, this);
             parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
         }
     } else {
-        m_placeholder->setStyle(style);
-        m_placeholder->setStyleWithWritingModeOfParent(style);
+        m_placeholder->setStyle(std::move(style));
+        m_placeholder->setStyleWithWritingModeOfParent(std::move(style));
     }
 }