Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/cocoa/panels/panel_utils_cocoa.mm

-// 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.
-
-#import "chrome/browser/ui/cocoa/panels/panel_utils_cocoa.h"
-
-namespace cocoa_utils {
-
-NSRect ConvertRectToCocoaCoordinates(const gfx::Rect& bounds) {
-  // Flip coordinates based on the primary screen.
-  NSScreen* screen = [[NSScreen screens] firstObject];
-
-  return NSMakeRect(
-      bounds.x(), NSHeight([screen frame]) - bounds.height() - bounds.y(),
-      bounds.width(), bounds.height());
-}
-
-gfx::Rect ConvertRectFromCocoaCoordinates(NSRect bounds) {
-  // Flip coordinates based on the primary screen.
-  NSScreen* screen = [[NSScreen screens] firstObject];
-
-  return gfx::Rect(
-      NSMinX(bounds), NSHeight([screen frame]) - NSMaxY(bounds),
-      NSWidth(bounds), NSHeight(bounds));
-}
-
-NSPoint ConvertPointToCocoaCoordinates(const gfx::Point& point) {
-  // Flip coordinates based on the primary screen.
-  NSScreen* screen = [[NSScreen screens] firstObject];
-
-  return NSMakePoint(point.x(), NSHeight([screen frame]) - point.y());
-}
-
-gfx::Point ConvertPointFromCocoaCoordinates(NSPoint point) {
-  // Flip coordinates based on the primary screen.
-  NSScreen* screen = [[NSScreen screens] firstObject];
-
-  return gfx::Point(point.x, NSHeight([screen frame]) - point.y);
-}
-
-}  // namespace cocoa_utils