Pure pedantry: Replace all ".size() == 0" with ".empty()".

chrome/browser/autocomplete/autocomplete_popup_view_mac.mm

 // Copyright (c) 2010 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 <cmath>
 
 #include "chrome/browser/autocomplete/autocomplete_popup_view_mac.h"
 
 #include "base/stl_util-inl.h"
 #include "base/sys_string_conversions.h"
@@ skipping 151 matching lines @@
     return aString;
   }
 
   // If ElideText() decides to do nothing, nothing to be done.
   const string16 elided = ui::ElideText(originalString, font, width, false);
   if (0 == elided.compare(originalString)) {
     return aString;
   }
 
   // If everything was elided away, clear the string.
-  if (elided.size() == 0) {
+  if (elided.empty()) {
     [aString deleteCharactersInRange:NSMakeRange(0, [aString length])];
     return aString;
   }
 
   // The ellipses should be the last character, and everything before
   // that should match the original string.
   const size_t i(elided.size() - 1);
   DCHECK_NE(0, elided.compare(0, i, originalString));
 
   // Replace the end of |aString| with the ellipses from |elided|.
@@ skipping 638 matching lines @@
                        bottomRightCornerRadius:kPopupRoundingRadius];
 
   // Draw the matrix clipped to our border.
   [NSGraphicsContext saveGraphicsState];
   [path addClip];
   [super drawRect:rect];
   [NSGraphicsContext restoreGraphicsState];
 }
 
 @end