Fix CrossProcessMouseEnterAndLeaveTest on Mac

SitePerProcessBrowserTest.CrossProcessMouseEnterAndLeaveTest is failing
on the Mac continuous build. The logs appear to show that the event
targeting is missing the correct frames, which might be because of the
inverted y-axis affecting GetViewBounds(). This CL should fix that
problem.

TBR=avi@chromium.org
BUG=647202

Review-Url: https://codereview.chromium.org/2346843002
Cr-Commit-Position: refs/heads/master@{#418893}

content/browser/site_per_process_browsertest.cc

@@ -1365,10 +1365,10 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest,
       d_node->current_frame_host()->GetRenderWidgetHost());
 
   gfx::Point point_in_a_frame(2, 2);
-  gfx::Point point_in_b_frame(rwhv_b->GetViewBounds().x() + 2,
-                              rwhv_b->GetViewBounds().y() + 2);
-  gfx::Point point_in_d_frame(rwhv_d->GetViewBounds().x() + 2,
-                              rwhv_d->GetViewBounds().y() + 2);
+  gfx::Point point_in_b_frame(rwhv_b->GetViewBounds().x(),
+                              rwhv_b->GetViewBounds().y());
+  gfx::Point point_in_d_frame(rwhv_d->GetViewBounds().x(),
+                              rwhv_d->GetViewBounds().y());
 
   blink::WebMouseEvent mouse_event;
   mouse_event.type = blink::WebInputEvent::MouseMove;