Split DownloadItem into an ABC, an Impl, and a Mock.

chrome/browser/ui/cocoa/download/download_util_mac.mm

 // 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.
 //
 // Download utility implementation for Mac OS X.
 
 #include "chrome/browser/ui/cocoa/download/download_util_mac.h"
 
 #include "base/sys_string_conversions.h"
 #import "chrome/browser/ui/cocoa/dock_icon.h"
@@ skipping 23 matching lines @@
   FNNotifyByPath(
       reinterpret_cast<const UInt8*>([parentPath fileSystemRepresentation]),
       kFNDirectoryModifiedMessage,
       kNilOptions);
 }
 
 void DragDownload(const DownloadItem* download,
                   gfx::Image* icon,
                   gfx::NativeView view) {
   NSPasteboard* pasteboard = [NSPasteboard pasteboardWithName:NSDragPboard];
-  AddFileToPasteboard(pasteboard, download->full_path());
+  AddFileToPasteboard(pasteboard, download->GetFullPath());
 
   // Synthesize a drag event, since we don't have access to the actual event
   // that initiated a drag (possibly consumed by the Web UI, for example).
   NSPoint position = [[view window] mouseLocationOutsideOfEventStream];
   NSTimeInterval eventTime = [[NSApp currentEvent] timestamp];
   NSEvent* dragEvent = [NSEvent mouseEventWithType:NSLeftMouseDragged
                                           location:position
                                      modifierFlags:NSLeftMouseDraggedMask
                                          timestamp:eventTime
                                       windowNumber:[[view window] windowNumber]
@@ skipping 16 matching lines @@
                                    bool progress_known,
                                    float progress) {
   DockIcon* dock_icon = [DockIcon sharedDockIcon];
   [dock_icon setDownloads:download_count];
   [dock_icon setIndeterminate:!progress_known];
   [dock_icon setProgress:progress];
   [dock_icon updateIcon];
 }
 
 }  // namespace download_util