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

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index ed4b065efad25123fe081ad40847db3b36213341..b0cd7d74362e130d4c0652d51b0f53844a8f56c2 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -6504,7 +6504,7 @@ class HLoadNamedField FINAL : public HTemplateInstruction<2> {
                   HValue* dependency,
                   HObjectAccess access)
       : access_(access), maps_(NULL) {
-    DCHECK_NOT_NULL(object);
+    DCHECK(object);
     SetOperandAt(0, object);
     SetOperandAt(1, dependency ? dependency : object);
 
@@ -6540,10 +6540,10 @@ class HLoadNamedField FINAL : public HTemplateInstruction<2> {
                   const UniqueSet<Map>* maps,
                   HType type)
       : HTemplateInstruction<2>(type), access_(access), maps_(maps) {
-    DCHECK_NOT_NULL(maps);
+    DCHECK(maps);
     DCHECK_NE(0, maps->size());
 
-    DCHECK_NOT_NULL(object);
+    DCHECK(object);
     SetOperandAt(0, object);
     SetOperandAt(1, dependency ? dependency : object);