Replace use of logging::DEBUG_MODE with DCHECK_IS_ON().

base/logging_unittest.cc

Index: base/logging_unittest.cc
diff --git a/base/logging_unittest.cc b/base/logging_unittest.cc
index 52ba9880b36a3632ccd74277360ff6c6a7eb92f7..04f349cab63913d9fcb7f9c1a0c1643ad248488f 100644
--- a/base/logging_unittest.cc
+++ b/base/logging_unittest.cc
@@ -69,16 +69,14 @@ class MockLogSource {
 
 TEST_F(LoggingTest, BasicLogging) {
   MockLogSource mock_log_source;
-  EXPECT_CALL(mock_log_source, Log()).Times(DEBUG_MODE ? 16 : 8).
-      WillRepeatedly(Return("log message"));
+  EXPECT_CALL(mock_log_source, Log())
+      .Times(DCHECK_IS_ON() ? 16 : 8)
+      .WillRepeatedly(Return("log message"));
 
   SetMinLogLevel(LOG_INFO);
 
   EXPECT_TRUE(LOG_IS_ON(INFO));
-  // As of g++-4.5, the first argument to EXPECT_EQ cannot be a
-  // constant expression.
-  const bool kIsDebugMode = (DEBUG_MODE != 0);
-  EXPECT_TRUE(kIsDebugMode == DLOG_IS_ON(INFO));
+  EXPECT_TRUE((DCHECK_IS_ON() != 0) == DLOG_IS_ON(INFO));
   EXPECT_TRUE(VLOG_IS_ON(0));
 
   LOG(INFO) << mock_log_source.Log();