Clear the text cache when the tooltip text is updated.

chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc

 // Copyright (c) 2012 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/bookmarks/bookmark_bar_view.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 232 matching lines @@
   }
 
   SkColor GetInkDropBaseColor() const override {
     return GetThemeProvider()->GetColor(
         ThemeProperties::COLOR_TOOLBAR_BUTTON_ICON);
   }
 
  private:
   std::unique_ptr<gfx::SlideAnimation> show_animation_;
 
-
   DISALLOW_COPY_AND_ASSIGN(BookmarkButtonBase);
 };
 
 // BookmarkButton -------------------------------------------------------------
 
 // Buttons used for the bookmarks on the bookmark bar.
 
 class BookmarkButton : public BookmarkButtonBase {
  public:
   // The internal view class name.
@@ skipping 18 matching lines @@
       max_tooltip_width_ = max_tooltip_width;
       tooltip_text_ = BookmarkBarView::CreateToolTipForURLAndTitle(
           max_tooltip_width_, tooltip_manager->GetFontList(), url_, GetText());
     }
     *tooltip_text = tooltip_text_;
     return !tooltip_text->empty();
   }
 
   void SetText(const base::string16& text) override {
     BookmarkButtonBase::SetText(text);
-    tooltip_text_.empty();
+    tooltip_text_.clear();
   }
 
   const char* GetClassName() const override { return kViewClassName; }
 
  private:
   // A cached value of maximum width for tooltip to skip generating
   // new tooltip text.
   mutable int max_tooltip_width_ = 0;
   mutable base::string16 tooltip_text_;
   const GURL& url_;
@@ skipping 1845 matching lines @@
     return;
   apps_page_shortcut_->SetVisible(visible);
   UpdateBookmarksSeparatorVisibility();
   LayoutAndPaint();
 }
 
 void BookmarkBarView::OnShowManagedBookmarksPrefChanged() {
   if (UpdateOtherAndManagedButtonsVisibility())
     LayoutAndPaint();
 }