Add blink::WebInputEvent::IsPinchGestureEventType().

components/guest_view/browser/guest_view_base.cc

Index: components/guest_view/browser/guest_view_base.cc
diff --git a/components/guest_view/browser/guest_view_base.cc b/components/guest_view/browser/guest_view_base.cc
index 71747bd58c405988fe9ecdaad5ba81df2d063eeb..41894f4ed2801ff357da8fad858b0c9bdcdf28ad 100644
--- a/components/guest_view/browser/guest_view_base.cc
+++ b/components/guest_view/browser/guest_view_base.cc
@@ -149,7 +149,7 @@ class GuestViewBase::OwnerContentsObserver : public WebContentsObserver {
 // WebContents goes away before the GuestViewBase is attached.
 class GuestViewBase::OpenerLifetimeObserver : public WebContentsObserver {
  public:
-  OpenerLifetimeObserver(GuestViewBase* guest)
+  explicit OpenerLifetimeObserver(GuestViewBase* guest)
       : WebContentsObserver(guest->GetOpener()->web_contents()),
         guest_(guest) {}
 
@@ -674,9 +674,7 @@ bool GuestViewBase::ShouldFocusPageAfterCrash() {
 
 bool GuestViewBase::PreHandleGestureEvent(WebContents* source,
                                           const blink::WebGestureEvent& event) {
-  return event.GetType() == blink::WebGestureEvent::kGesturePinchBegin ||
-         event.GetType() == blink::WebGestureEvent::kGesturePinchUpdate ||
-         event.GetType() == blink::WebGestureEvent::kGesturePinchEnd;
+  return blink::WebInputEvent::IsPinchGestureEventType(event.GetType());
 }
 
 void GuestViewBase::UpdatePreferredSize(WebContents* target_web_contents,