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

base/guid_unittest.cc

Index: base/guid_unittest.cc
diff --git a/base/guid_unittest.cc b/base/guid_unittest.cc
index 18c04a9d3363d42f256d53a8dd9b915e22e5a5dc..7ecb1d88fdcef9f29d532653aee658c80a0452a2 100644
--- a/base/guid_unittest.cc
+++ b/base/guid_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <limits>
 
+#include "base/strings/string_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_POSIX)
@@ -27,6 +28,7 @@ TEST(GUIDTest, GUIDCorrectlyFormatted) {
   for (int it = 0; it < kIterations; ++it) {
     std::string guid = base::GenerateGUID();
     EXPECT_TRUE(base::IsValidGUID(guid));
+    EXPECT_TRUE(base::IsValidGUID(base::StringToLowerASCII(guid)));

[Mark Mentovai, 2014/09/04 22:59:03]

Do this with StringToUpperASCII too, in case GenerateGUID starts returning
lowercase versions someday.

[Ben Chan, 2014/09/04 23:05:17]

Done

I like the idea!  it's weird that StringToUpperASCII is outside base namespace
though

   }
 }