Fix potential crashes in setHasHorizontal/VerticalScrollbar.

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 44f06f71c39688b9e294c312eb2d608559822fb4..fbfa181763739c9fa617b70a60f6cb6c475ef411 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -3387,8 +3387,7 @@ void FrameView::addChild(Widget* child) {
 }
 
 void FrameView::setHasHorizontalScrollbar(bool hasBar) {
-  DCHECK(m_frame->settings());
-  if (m_frame->settings()->hideScrollbars())
+  if (m_frame->settings() && m_frame->settings()->hideScrollbars())
     hasBar = false;
 
   if (hasBar == !!m_horizontalScrollbar)
@@ -3414,8 +3413,7 @@ void FrameView::setHasHorizontalScrollbar(bool hasBar) {
 }
 
 void FrameView::setHasVerticalScrollbar(bool hasBar) {
-  DCHECK(m_frame->settings());
-  if (m_frame->settings()->hideScrollbars())
+  if (m_frame->settings() && m_frame->settings()->hideScrollbars())
     hasBar = false;
 
   if (hasBar == !!m_verticalScrollbar)