Make base::IsValidGUID() accept GUID strings in lowercase.

base/guid_unittest.cc

 // Copyright (c) 2012 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 "base/guid.h"
 
 #include <limits>
 
+#include "base/strings/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_POSIX)
 TEST(GUIDTest, GUIDGeneratesAllZeroes) {
   uint64 bytes[] = { 0, 0 };
   std::string clientid = base::RandomDataToGUIDString(bytes);
   EXPECT_EQ("00000000-0000-0000-0000-000000000000", clientid);
 }
 
 TEST(GUIDTest, GUIDGeneratesCorrectly) {
   uint64 bytes[] = { 0x0123456789ABCDEFULL, 0xFEDCBA9876543210ULL };
   std::string clientid = base::RandomDataToGUIDString(bytes);
   EXPECT_EQ("01234567-89AB-CDEF-FEDC-BA9876543210", clientid);
 }
 #endif
 
 TEST(GUIDTest, GUIDCorrectlyFormatted) {
   const int kIterations = 10;
   for (int it = 0; it < kIterations; ++it) {
     std::string guid = base::GenerateGUID();
     EXPECT_TRUE(base::IsValidGUID(guid));
+    EXPECT_TRUE(base::IsValidGUID(base::StringToLowerASCII(guid)));
+    EXPECT_TRUE(base::IsValidGUID(StringToUpperASCII(guid)));
   }
 }
 
 TEST(GUIDTest, GUIDBasicUniqueness) {
   const int kIterations = 10;
   for (int it = 0; it < kIterations; ++it) {
     std::string guid1 = base::GenerateGUID();
     std::string guid2 = base::GenerateGUID();
     EXPECT_EQ(36U, guid1.length());
     EXPECT_EQ(36U, guid2.length());
     EXPECT_NE(guid1, guid2);
   }
 }