Work on getting things built with -Wimplicit-fallthrough. This CL was uploaded by git cl split.

Bug: 177475
R=oshima@chromium.org

Change-Id: Id75257a2890576c0ff7c913fcb3daccf8296839a
Reviewed-on: https://chromium-review.googlesource.com/889778Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532135}

ui/views/controls/textfield/textfield.cc

@@ -1685,7 +1685,7 @@ void Textfield::ExecuteTextEditCommand(ui::TextEditCommand command) {
     case ui::TextEditCommand::DELETE_TO_END_OF_LINE:
     case ui::TextEditCommand::DELETE_TO_END_OF_PARAGRAPH:
       add_to_kill_buffer = text_input_type_ != ui::TEXT_INPUT_TYPE_PASSWORD;
-    // Fall through.
+      FALLTHROUGH;
     case ui::TextEditCommand::DELETE_WORD_BACKWARD:
     case ui::TextEditCommand::DELETE_WORD_FORWARD:
       if (HasSelection())