[MD User Menu] Removed the tooltips for profile buttons

chrome/browser/ui/views/profiles/profile_chooser_view.cc

Index: chrome/browser/ui/views/profiles/profile_chooser_view.cc
diff --git a/chrome/browser/ui/views/profiles/profile_chooser_view.cc b/chrome/browser/ui/views/profiles/profile_chooser_view.cc
index 395783601cd5ca91555ac46453564043d446bc6a..9a1400afd519b4b253b12770ba69c0a90839ae7d 100644
--- a/chrome/browser/ui/views/profiles/profile_chooser_view.cc
+++ b/chrome/browser/ui/views/profiles/profile_chooser_view.cc
@@ -198,6 +198,10 @@ class BackgroundColorHoverButton : public views::LabelButton {
         views::Border::CreateEmptyBorder(0, button_margin, 0, button_margin));
     SetFocusForPlatform();
     set_request_focus_on_press(true);
+
+    if (switches::IsMaterialDesignUserMenu()) {
+      label()->SetHandlesTooltips(false);

[sky, 2016/08/11 03:25:35]

The other option is to not set a tooltip. Not setting a tooltip seems a bit less
obscure than calling this after the fact. Is there a reason you need to set the
tooltip for the md case?

[Jane, 2016/08/11 14:59:04]

I don't need to set the tooltip for the MD case, and I agree that it's better to
just not set the tooltip. But I couldn't find a way to do it - it seems that
LabelButton's Label controls the tooltip text and sets it to be the full text of
the label by default
(https://cs.chromium.org/chromium/src/ui/views/controls/label.cc?sq=package:ch...).
Am I missing something? Thanks!

+    }
   }
 
   BackgroundColorHoverButton(views::ButtonListener* listener,