Update ToLower/UpperASCII API

net/http/http_util_unittest.cc

Index: net/http/http_util_unittest.cc
diff --git a/net/http/http_util_unittest.cc b/net/http/http_util_unittest.cc
index 6ea1ca479e7edbad150bcb1cbd6255508bc286aa..a5c984db66b1f5e46798036e8c1ac3758fab9f81 100644
--- a/net/http/http_util_unittest.cc
+++ b/net/http/http_util_unittest.cc
@@ -50,8 +50,7 @@ TEST(HttpUtilTest, IsSafeHeader) {
   for (size_t i = 0; i < arraysize(unsafe_headers); ++i) {
     EXPECT_FALSE(HttpUtil::IsSafeHeader(unsafe_headers[i]))
       << unsafe_headers[i];
-    EXPECT_FALSE(HttpUtil::IsSafeHeader(
-        base::StringToUpperASCII(std::string(unsafe_headers[i]))))
+    EXPECT_FALSE(HttpUtil::IsSafeHeader(base::ToUpperASCII(unsafe_headers[i])))
         << unsafe_headers[i];
   }
   static const char* const safe_headers[] = {
@@ -96,8 +95,7 @@ TEST(HttpUtilTest, IsSafeHeader) {
   };
   for (size_t i = 0; i < arraysize(safe_headers); ++i) {
     EXPECT_TRUE(HttpUtil::IsSafeHeader(safe_headers[i])) << safe_headers[i];
-    EXPECT_TRUE(HttpUtil::IsSafeHeader(
-        base::StringToUpperASCII(std::string(safe_headers[i]))))
+    EXPECT_TRUE(HttpUtil::IsSafeHeader(base::ToUpperASCII(safe_headers[i])))
         << safe_headers[i];
   }
 }