events: Update key-event handlers to not return EventResult.

ui/views/widget/widget_unittest.cc

Index: ui/views/widget/widget_unittest.cc
diff --git a/ui/views/widget/widget_unittest.cc b/ui/views/widget/widget_unittest.cc
index b57ccbd053b28b2d0e23282f95ce5502b2285c0c..5a001b8c69170633375d909544da7b8bb8247439 100644
--- a/ui/views/widget/widget_unittest.cc
+++ b/ui/views/widget/widget_unittest.cc
@@ -1029,9 +1029,11 @@ TEST_F(WidgetTest, KeyboardInputEvent) {
 
   // The press gets handled. The release doesn't have an effect.
   ui::KeyEvent backspace_p(ui::ET_KEY_PRESSED, ui::VKEY_DELETE, 0, false);
-  EXPECT_TRUE(toplevel->OnKeyEvent(backspace_p));
+  toplevel->OnKeyEvent(&backspace_p);
+  EXPECT_TRUE(backspace_p.stopped_propagation());
   ui::KeyEvent backspace_r(ui::ET_KEY_RELEASED, ui::VKEY_DELETE, 0, false);
-  EXPECT_FALSE(toplevel->OnKeyEvent(backspace_r));
+  toplevel->OnKeyEvent(&backspace_r);
+  EXPECT_FALSE(backspace_r.handled());
 
   toplevel->Close();
 }