[MD User Menu] Removed the tooltips for profile buttons

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/profiles/profile_chooser_view.h"
 
 #include "base/macros.h"
 #include "base/metrics/user_metrics.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 180 matching lines @@
     SetImageLabelSpacing(switches::IsMaterialDesignUserMenu()
                              ? (kMaterialMenuEdgeMargin - 2)
                              : views::kItemLabelSpacing);
     const int button_margin = switches::IsMaterialDesignUserMenu()
                                   ? kMaterialMenuEdgeMargin
                                   : views::kButtonHEdgeMarginNew;
     SetBorder(
         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,
                              const base::string16& text,
                              const gfx::ImageSkia& icon)
       : BackgroundColorHoverButton(listener, text) {
     SetMinSize(gfx::Size(
         icon.width(), kButtonHeight + views::kRelatedControlVerticalSpacing));
     SetImage(STATE_NORMAL, icon);
   }
@@ skipping 2083 matching lines @@
       IncognitoModePrefs::GetAvailability(browser_->profile()->GetPrefs()) !=
           IncognitoModePrefs::DISABLED;
   return incognito_available && !browser_->profile()->IsGuestSession();
 }
 
 void ProfileChooserView::PostActionPerformed(
     ProfileMetrics::ProfileDesktopMenu action_performed) {
   ProfileMetrics::LogProfileDesktopMenu(action_performed, gaia_service_type_);
   gaia_service_type_ = signin::GAIA_SERVICE_TYPE_NONE;
 }