Collapse the API surface on WebInputEvent via accessor functions.

extensions/browser/app_window/app_web_contents_helper.cc

Index: extensions/browser/app_window/app_web_contents_helper.cc
diff --git a/extensions/browser/app_window/app_web_contents_helper.cc b/extensions/browser/app_window/app_web_contents_helper.cc
index 1dbbcd0df739611f6376d95b027712af8f9c6ef3..7c5e4900ea2cb881c2e8b60008396f838ffb81ac 100644
--- a/extensions/browser/app_window/app_web_contents_helper.cc
+++ b/extensions/browser/app_window/app_web_contents_helper.cc
@@ -33,9 +33,9 @@ AppWebContentsHelper::AppWebContentsHelper(
 bool AppWebContentsHelper::ShouldSuppressGestureEvent(
     const blink::WebGestureEvent& event) {
   // Disable pinch zooming in app windows.
-  return event.type == blink::WebGestureEvent::GesturePinchBegin ||
-         event.type == blink::WebGestureEvent::GesturePinchUpdate ||
-         event.type == blink::WebGestureEvent::GesturePinchEnd;
+  return event.type() == blink::WebGestureEvent::GesturePinchBegin ||
+         event.type() == blink::WebGestureEvent::GesturePinchUpdate ||
+         event.type() == blink::WebGestureEvent::GesturePinchEnd;
 }
 
 content::WebContents* AppWebContentsHelper::OpenURLFromTab(