Replace wstring with string16 in sandbox

sandbox/win/src/handle_policy_test.cc

Index: sandbox/win/src/handle_policy_test.cc
diff --git a/sandbox/win/src/handle_policy_test.cc b/sandbox/win/src/handle_policy_test.cc
index 11e888abe72ef9fd2ee56b49f61fd5184212aa51..0664babe7b56b122c78e799056e15b009ac7cbab 100644
--- a/sandbox/win/src/handle_policy_test.cc
+++ b/sandbox/win/src/handle_policy_test.cc
@@ -54,7 +54,7 @@ TEST(HandlePolicyTest, DuplicateHandle) {
   EXPECT_EQ(SBOX_TEST_SUCCEEDED, target.RunTest(L"Handle_WaitProcess 30000"));
 
   // First test that we fail to open the event.
-  std::wstring cmd_line = base::StringPrintf(L"Handle_DuplicateEvent %d",
+  base::string16 cmd_line = base::StringPrintf(L"Handle_DuplicateEvent %d",
                                              target.process_id());
   EXPECT_EQ(SBOX_TEST_DENIED, runner.RunTest(cmd_line.c_str()));
 
@@ -76,7 +76,7 @@ TEST(HandlePolicyTest, DuplicatePeerHandle) {
   EXPECT_EQ(SBOX_TEST_SUCCEEDED, target.RunTest(L"Handle_WaitProcess 30000"));
 
   // First test that we fail to open the event.
-  std::wstring cmd_line = base::StringPrintf(L"Handle_DuplicateEvent %d",
+  base::string16 cmd_line = base::StringPrintf(L"Handle_DuplicateEvent %d",
                                              target.process_id());
   EXPECT_EQ(SBOX_TEST_DENIED, runner.RunTest(cmd_line.c_str()));
 
@@ -92,7 +92,7 @@ TEST(HandlePolicyTest, DuplicateBrokerHandle) {
   TestRunner runner;
 
   // First test that we fail to open the event.
-  std::wstring cmd_line = base::StringPrintf(L"Handle_DuplicateEvent %d",
+  base::string16 cmd_line = base::StringPrintf(L"Handle_DuplicateEvent %d",
                                              ::GetCurrentProcessId());
   EXPECT_EQ(SBOX_TEST_DENIED, runner.RunTest(cmd_line.c_str()));