Initial switch to Chromium-style CHECK_* and DCHECK_* macros.

test/cctest/test-sampler-api.cc

Index: test/cctest/test-sampler-api.cc
diff --git a/test/cctest/test-sampler-api.cc b/test/cctest/test-sampler-api.cc
index 2f6f92eb19c26556104a6920a6958d51b5a7f7c6..bc3c40b2820d75ae2fb324ccaa54f6a5d75a42bf 100644
--- a/test/cctest/test-sampler-api.cc
+++ b/test/cctest/test-sampler-api.cc
@@ -85,7 +85,7 @@ class SamplingTestHelper {
 
   explicit SamplingTestHelper(const std::string& test_function)
       : sample_is_taken_(false), isolate_(CcTest::isolate()) {
-    DCHECK_EQ(NULL, instance_);
+    DCHECK(!instance_);
     instance_ = this;
     v8::HandleScope scope(isolate_);
     v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New(isolate_);
@@ -236,10 +236,10 @@ TEST(StackFramesConsistent) {
 
   const SamplingTestHelper::CodeEventEntry* entry;
   entry = helper.FindEventEntry(sample.begin()[0]);
-  CHECK_NE(NULL, entry);
+  CHECK(entry);
   CHECK(std::string::npos != entry->name.find("test_sampler_api_inner"));
 
   entry = helper.FindEventEntry(sample.begin()[1]);
-  CHECK_NE(NULL, entry);
+  CHECK(entry);
   CHECK(std::string::npos != entry->name.find("test_sampler_api_outer"));
 }