Update gmock and gtest.

testing/gmock/src/gmock-internal-utils.cc

 // Copyright 2007, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 46 matching lines @@
   for (const char* p = id_name; *p != '\0'; prev_char = *(p++)) {
     // We don't care about the current locale as the input is
     // guaranteed to be a valid C++ identifier name.
     const bool starts_new_word = isupper(*p) ||
         (!isalpha(prev_char) && islower(*p)) ||
         (!isdigit(prev_char) && isdigit(*p));
 
     if (isalnum(*p)) {
       if (starts_new_word && result != "")
         result += ' ';
-      result += tolower(*p);
+      result += static_cast<char>(tolower(*p));
     }
   }
   return result;
 }
 
 // This class reports Google Mock failures as Google Test failures.  A
 // user can define another class in a similar fashion if he intends to
 // use Google Mock with a testing framework other than Google Test.
 class GoogleTestFailureReporter : public FailureReporterInterface {
  public:
@@ skipping 86 matching lines @@
     }
     std::cout << "Stack trace:\n"
          << ::testing::internal::GetCurrentOsStackTraceExceptTop(
              ::testing::UnitTest::GetInstance(), actual_to_skip);
   }
   std::cout << ::std::flush;
 }
 
 }  // namespace internal
 }  // namespace testing