Make sure ShellIntegration::CommandLineArgsForLauncher respects the UserDataDir policy.

chrome/browser/policy/policy_path_parser_mac.mm

Index: chrome/browser/policy/policy_path_parser_mac.mm
diff --git a/chrome/browser/policy/policy_path_parser_mac.mm b/chrome/browser/policy/policy_path_parser_mac.mm
index c9823d4d959fb5b608673a80e4f94b6e267e524d..f7ad216158d77b465cfdfee7390a50daa06b4116 100644
--- a/chrome/browser/policy/policy_path_parser_mac.mm
+++ b/chrome/browser/policy/policy_path_parser_mac.mm
@@ -4,8 +4,12 @@
 
 #include "chrome/browser/policy/policy_path_parser.h"
 
+#include "base/basictypes.h"
+#include "base/file_path.h"
 #include "base/logging.h"
 #include "base/sys_string_conversions.h"
+#import "base/mac/scoped_nsautorelease_pool.h"
+#include "policy/policy_constants.h"
 
 #import <Cocoa/Cocoa.h>
 #import <SystemConfiguration/SCDynamicStore.h>
@@ -90,6 +94,23 @@ base::FilePath::StringType ExpandPathVariables(
   return result;
 }
 
+void CheckUserDataDirPolicy(base::FilePath* user_data_dir) {
+  base::mac::ScopedNSAutoreleasePool pool;
+
+  // Since the configuration management infrastructure is not initialized when
+  // this code runs, read the policy preference directly.
+  NSString* key = base::SysUTF8ToNSString(policy::key::kUserDataDir);
+  NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
+  NSString* value = [defaults stringForKey:key];
+  if (value && [defaults objectIsForcedForKey:key]) {
+    std::string string_value = base::SysNSStringToUTF8(value);
+    // Now replace any vars the user might have used.
+    string_value =
+        policy::path_parser::ExpandPathVariables(string_value);
+    *user_data_dir = base::FilePath(string_value);
+  }
+}
+
 }  // namespace path_parser
 
 }  // namespace policy