Change other usages of .size() to .empty() when applicable.

chrome/browser/ui/gtk/rounded_window.cc

 // Copyright (c) 2011 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/gtk/rounded_window.h"
 
 #include <gtk/gtk.h>
 #include <math.h>
 
 #include "base/i18n/rtl.h"
@@ skipping 214 matching lines @@
   gdk_gc_set_clip_rectangle(gc, &event->area);
   gdk_gc_set_rgb_fg_color(gc, &data->border_color);
 
   // Stroke the frame border.
   std::vector<GdkPoint> points = MakeFramePolygonPoints(
       data, FRAME_STROKE);
   if (data->drawn_borders == BORDER_ALL) {
     // If we want to have borders everywhere, we need to draw a polygon instead
     // of a set of lines.
     gdk_draw_polygon(drawable, gc, FALSE, &points[0], points.size());
-  } else if (points.size() > 0) {
+  } else if (!points.empty()) {
     gdk_draw_lines(drawable, gc, &points[0], points.size());
   }
 
   g_object_unref(gc);
   return FALSE;  // Propagate so our children paint, etc.
 }
 
 // On theme changes, window shapes are reset, but we detect whether we need to
 // reshape a window by whether its allocation has changed so force it to reset
 // the window shape on next expose.
@@ skipping 66 matching lines @@
 
 void SetRoundedWindowBorderColor(GtkWidget* widget, GdkColor color) {
   DCHECK(widget);
   RoundedWindowData* data = static_cast<RoundedWindowData*>(
       g_object_get_data(G_OBJECT(widget), kRoundedData));
   DCHECK(data);
   data->border_color = color;
 }
 
 }  // namespace gtk_util