Add standard policy provider tests for PReg policy reading.

chrome/browser/policy/policy_loader_win.cc

Index: chrome/browser/policy/policy_loader_win.cc
diff --git a/chrome/browser/policy/policy_loader_win.cc b/chrome/browser/policy/policy_loader_win.cc
index 2abbeebb2b498fa9715549cd3b9aaf077e29e6c7..3691a7600f5d172bb6c21d117b2743ff4b0dc2df 100644
--- a/chrome/browser/policy/policy_loader_win.cc
+++ b/chrome/browser/policy/policy_loader_win.cc
@@ -4,14 +4,14 @@
 
 #include "chrome/browser/policy/policy_loader_win.h"
 
-#include <string>
-#include <vector>
-
 #include <rpc.h>      // For struct GUID
 #include <shlwapi.h>  // For PathIsUNC()
 #include <userenv.h>  // For GPO functions
 #include <windows.h>
 
+#include <string>
+#include <vector>
+
 // shlwapi.dll is required for PathIsUNC().
 #pragma comment(lib, "shlwapi.lib")
 // userenv.dll is required for various GPO functions.
@@ -19,7 +19,6 @@
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
-#include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ -55,10 +54,6 @@ const char kKeyThirdParty[] = "3rdparty";
 // The GUID of the registry settings group policy extension.
 GUID kRegistrySettingsCSEGUID = REGISTRY_EXTENSION_GUID;
 
-// The PReg file name.
-const base::FilePath::CharType kPRegFileName[] =
-    FILE_PATH_LITERAL("Registry.pol");
-
 // A helper class encapsulating run-time-linked function calls to Wow64 APIs.
 class Wow64Functions {
  public:
@@ -449,6 +444,9 @@ void ParsePolicy(const base::DictionaryValue* gpo_dict,
 
 }  // namespace
 
+const base::FilePath::CharType PolicyLoaderWin::kPRegFileName[] =
+    FILE_PATH_LITERAL("Registry.pol");
+
 PolicyLoaderWin::PolicyLoaderWin(const PolicyDefinitionList* policy_list,
                                  const string16& chrome_policy_key,
                                  AppliedGPOListProvider* gpo_provider)