Revert of Use changed_button_flags() when converting MouseEvent to blink::WebMouseEvent.

content/browser/renderer_host/web_input_event_aura.cc

Index: content/browser/renderer_host/web_input_event_aura.cc
diff --git a/content/browser/renderer_host/web_input_event_aura.cc b/content/browser/renderer_host/web_input_event_aura.cc
index 55932b28d535012bebd184b3a2cd1c6dcaf76253..dfec167bda3d92e485d9a17165bd32127706d4c2 100644
--- a/content/browser/renderer_host/web_input_event_aura.cc
+++ b/content/browser/renderer_host/web_input_event_aura.cc
@@ -360,16 +360,11 @@
   webkit_event.timeStampSeconds = event->time_stamp().InSecondsF();
 
   webkit_event.button = blink::WebMouseEvent::ButtonNone;
-  int button_flags = event->flags();
-  if (event->type() == ui::ET_MOUSE_PRESSED ||
-      event->type() == ui::ET_MOUSE_RELEASED) {
-    button_flags = event->changed_button_flags();
-  }
-  if (button_flags & ui::EF_LEFT_MOUSE_BUTTON)
+  if (event->flags() & ui::EF_LEFT_MOUSE_BUTTON)
     webkit_event.button = blink::WebMouseEvent::ButtonLeft;
-  if (button_flags & ui::EF_MIDDLE_MOUSE_BUTTON)
+  if (event->flags() & ui::EF_MIDDLE_MOUSE_BUTTON)
     webkit_event.button = blink::WebMouseEvent::ButtonMiddle;
-  if (button_flags & ui::EF_RIGHT_MOUSE_BUTTON)
+  if (event->flags() & ui::EF_RIGHT_MOUSE_BUTTON)
     webkit_event.button = blink::WebMouseEvent::ButtonRight;
 
   switch (event->type()) {