[Code cleanup] Change screenPosition to screen_position in RenderWidgetHostViewGuest

This CL changes the variable name only, should not introduce any behavior
change.

TBR=alexmos@chromium.org

Bug: None
Change-Id: I0e249eb585bc8e2953bef51f93995eab18d73937
Reviewed-on: https://chromium-review.googlesource.com/1176272Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584291}

content/browser/frame_host/render_widget_host_view_guest.cc

@@ -622,15 +622,15 @@ RenderWidgetHostViewGuest::GetOwnerRenderWidgetHostView() const {
 
 void RenderWidgetHostViewGuest::MaybeSendSyntheticTapGestureForTest(
     const blink::WebFloatPoint& position,
-    const blink::WebFloatPoint& screenPosition) const {
-  MaybeSendSyntheticTapGesture(position, screenPosition);
+    const blink::WebFloatPoint& screen_position) const {
+  MaybeSendSyntheticTapGesture(position, screen_position);
 }
 
 // TODO(wjmaclean): When we remove BrowserPlugin, delete this code.
 // http://crbug.com/533069
 void RenderWidgetHostViewGuest::MaybeSendSyntheticTapGesture(
     const blink::WebFloatPoint& position,
-    const blink::WebFloatPoint& screenPosition) const {
+    const blink::WebFloatPoint& screen_position) const {
   if (!HasFocus()) {
     // We need to a account for the position of the guest view within the
     // embedder, as well as the fact that the embedder's host will add its
@@ -646,7 +646,7 @@ void RenderWidgetHostViewGuest::MaybeSendSyntheticTapGesture(
         blink::kWebGestureDeviceTouchscreen);
     gesture_tap_event.SetPositionInWidget(
         blink::WebFloatPoint(position.x + offset.x(), position.y + offset.y()));
-    gesture_tap_event.SetPositionInScreen(screenPosition);
+    gesture_tap_event.SetPositionInScreen(screen_position);
     // The touch action may not be set yet because this is still at the
     // Pre-processing stage of a mouse or a touch event. In this case, set the
     // touch action to Auto to prevent crashing.

content/browser/frame_host/render_widget_host_view_guest.h

@@ -164,7 +164,7 @@ class CONTENT_EXPORT RenderWidgetHostViewGuest
 
   void MaybeSendSyntheticTapGestureForTest(
       const blink::WebFloatPoint& position,
-      const blink::WebFloatPoint& screenPosition) const;
+      const blink::WebFloatPoint& screen_position) const;
 
  private:
   friend class RenderWidgetHostView;
@@ -187,7 +187,7 @@ class CONTENT_EXPORT RenderWidgetHostViewGuest
   // http://crbug.com/533069
   void MaybeSendSyntheticTapGesture(
       const blink::WebFloatPoint& position,
-      const blink::WebFloatPoint& screenPosition) const;
+      const blink::WebFloatPoint& screen_position) const;
 
   void OnHandleInputEvent(RenderWidgetHostImpl* embedder,
                           int browser_plugin_instance_id,