[test] Test expectations in cctest should use CHECK and not DCHECK.

test/cctest/test-strings.cc

 // Copyright 2012 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 61 matching lines @@
       c++;
     }
     return (Q[i] = r - x);
   }
 
   uint32_t next(int max) {
     return next() % max;
   }
 
   bool next(double threshold) {
-    DCHECK(threshold >= 0.0 && threshold <= 1.0);
+    CHECK(threshold >= 0.0 && threshold <= 1.0);
     if (threshold == 1.0) return true;
     if (threshold == 0.0) return false;
     uint32_t value = next() % 100000;
     return threshold > static_cast<double>(value)/100000.0;
   }
 
  private:
   static const uint32_t kQSize = 4096;
   uint32_t Q[kQSize];
   uint32_t c;
@@ skipping 1380 matching lines @@
   Handle<String> arg0 = isolate->factory()->NewStringFromAsciiChecked("arg0");
   Handle<String> arg1 = isolate->factory()->NewStringFromAsciiChecked("arg1");
   Handle<String> arg2 = isolate->factory()->NewStringFromAsciiChecked("arg2");
   Handle<String> result =
       MessageTemplate::FormatMessage(MessageTemplate::kPropertyNotFunction,
                                      arg0, arg1, arg2).ToHandleChecked();
   Handle<String> expected = isolate->factory()->NewStringFromAsciiChecked(
       "'arg0' returned for property 'arg1' of object 'arg2' is not a function");
   CHECK(String::Equals(result, expected));
 }