base: Remove the string logging from CHECK().

components/tracing/test/perf_test_helpers.cc

Index: components/tracing/test/perf_test_helpers.cc
diff --git a/components/tracing/test/perf_test_helpers.cc b/components/tracing/test/perf_test_helpers.cc
index 0d57053cc5cf68290dfe90e5499785ca2bd31727..22208c2f1de31122b4ee1149ceaecb4d1497d5ed 100644
--- a/components/tracing/test/perf_test_helpers.cc
+++ b/components/tracing/test/perf_test_helpers.cc
@@ -15,10 +15,12 @@ namespace tracing {
 namespace {
 
 void PrintPerfTestMs(const std::string& name, int64_t value) {
-  CHECK(::testing::UnitTest::GetInstance() != nullptr) << "Must be GTest.";
+  // Must be GTest.
+  CHECK(::testing::UnitTest::GetInstance() != nullptr);
   const ::testing::TestInfo* test_info =
       ::testing::UnitTest::GetInstance()->current_test_info();
-  CHECK(test_info != nullptr) << "Must be GTest.";
+  // Must be GTest.
+  CHECK(test_info != nullptr);
 
   perf_test::PrintResult(test_info->test_case_name(),
                          std::string(".") + test_info->name(),