Remove all the OS X 10.6 SDK forward declarations.

chrome/common/chrome_paths_mac.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.
 
 #include "chrome/common/chrome_paths_internal.h"
 
 #import <Foundation/Foundation.h>
 #include <string.h>
 
 #include <string>
 
 #include "base/base_paths.h"
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #import "base/mac/mac_util.h"
 #import "base/mac/scoped_nsautorelease_pool.h"
 #include "base/path_service.h"
 #include "chrome/common/chrome_constants.h"
 
 namespace {
 
-// TODO(thestig) Remove this once we switch to the 10.6 SDK.
-#if !defined(MAC_OS_X_VERSION_10_6) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-#define NSPicturesDirectory 19
-#endif
-
 const FilePath* g_override_versioned_directory = NULL;
 
 // Return a retained (NOT autoreleased) NSBundle* as the internal
 // implementation of chrome::OuterAppBundle(), which should be the only
 // caller.
 NSBundle* OuterAppBundleInternal() {
   base::mac::ScopedNSAutoreleasePool pool;
 
   if (!base::mac::AmIBundled()) {
     // If unbundled (as in a test), there's no app bundle.
@@ skipping 171 matching lines @@
   return bundle;
 }
 
 bool ProcessNeedsProfileDir(const std::string& process_type) {
   // For now we have no reason to forbid this on other MacOS as we don't
   // have the roaming profile troubles there.
   return true;
 }
 
 }  // namespace chrome