Valgrind: Fix a leak in GetValueFromDictionary for cocoa.

base/mac/foundation_util.mm

Index: base/mac/foundation_util.mm
diff --git a/base/mac/foundation_util.mm b/base/mac/foundation_util.mm
index 44b81d32e5d5b1226c1dfc91514b4db9776c146b..6778c983a72c4c79920d7a7a97744182f72fd243 100644
--- a/base/mac/foundation_util.mm
+++ b/base/mac/foundation_util.mm
@@ -238,10 +238,12 @@ CFTypeRef GetValueFromDictionary(CFDictionaryRef dict,
     return value;
 
   if (CFGetTypeID(value) != expected_type) {
-    std::string expected_type_name = base::SysCFStringRefToUTF8(
+    ScopedCFTypeRef<CFStringRef> expected_type_name(
         CFCopyTypeIDDescription(expected_type));
+    std::string expected_type_utf8 =
+        base::SysCFStringRefToUTF8(expected_type_name);
     DLOG(WARNING) << GetValueFromDictionaryErrorMessage(key,
-                                                        expected_type_name,
+                                                        expected_type_utf8,
                                                         value);
     return NULL;
   }