First cut at Firefox import on OSX + stubs for Safari import.

chrome/browser/importer/firefox_importer_utils_mac.mm

+// Copyright (c) 2009 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 <Cocoa/Cocoa.h>
+
+#include "chrome/browser/importer/firefox_importer_utils.h"
+
+#include "base/file_util.h"
+
+FilePath GetProfilesINI() {
+  FilePath ini_file;
+  NSArray* dirs =
+      NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory,
+                                          NSUserDomainMask, YES);
+  if ([dirs count]) {
+    NSString* app_support_dir = [dirs objectAtIndex:0];
+    NSString* firefox_dir = [app_support_dir
+        stringByAppendingPathComponent:@"Firefox"];
+    NSString* profiles_ini = [firefox_dir
+        stringByAppendingPathComponent:@"profiles.ini"];
+    if (profiles_ini) {
+      ini_file = FilePath([profiles_ini fileSystemRepresentation]);
+    }
+  }
+  
+  if (file_util::PathExists(ini_file))
+    return ini_file;
+
+  return FilePath();
+}