RTC_[D]CHECK_op: Remove superfluous casts

webrtc/base/safe_compare_unittest.cc

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 358 matching lines @@
   EXPECT_TRUE(safe_cmp::Ge(2, 2.0));
   EXPECT_TRUE(safe_cmp::Ge(2.0, 2));
   EXPECT_TRUE(safe_cmp::Ge(2.0, 2.0));
 
   EXPECT_TRUE(safe_cmp::Ge(p1, p1));
   EXPECT_FALSE(safe_cmp::Ge(p1, p2));
   EXPECT_TRUE(safe_cmp::Ge(p2, p1));
   EXPECT_TRUE(safe_cmp::Ge(p2, p2));
 }
 
+TEST(SafeCmpTest, Enum) {
+  enum E1 { e1 = 13 };
+  enum { e2 = 13 };
+  enum E3 : unsigned { e3 = 13 };
+  enum : unsigned { e4 = 13 };
+  EXPECT_TRUE(safe_cmp::Eq(13, e1));
+  EXPECT_TRUE(safe_cmp::Eq(13u, e1));
+  EXPECT_TRUE(safe_cmp::Eq(13, e2));
+  EXPECT_TRUE(safe_cmp::Eq(13u, e2));
+  EXPECT_TRUE(safe_cmp::Eq(13, e3));
+  EXPECT_TRUE(safe_cmp::Eq(13u, e3));
+  EXPECT_TRUE(safe_cmp::Eq(13, e4));
+  EXPECT_TRUE(safe_cmp::Eq(13u, e4));
+}
+
 }  // namespace rtc