Replace ASSERT and ASSERT_NOT_REACHED in core/style/

third_party/WebKit/Source/core/style/DataRef.h

Index: third_party/WebKit/Source/core/style/DataRef.h
diff --git a/third_party/WebKit/Source/core/style/DataRef.h b/third_party/WebKit/Source/core/style/DataRef.h
index 9d23272500553d5004a51b46e1a4ce6e644df538..eeba842ac775caedcb49d5e70474b538525a7b9e 100644
--- a/third_party/WebKit/Source/core/style/DataRef.h
+++ b/third_party/WebKit/Source/core/style/DataRef.h
@@ -46,19 +46,19 @@ class DataRef {
   }
 
   void init() {
-    ASSERT(!m_data);
+    DCHECK(!m_data);
     m_data = T::create();
   }
 
   bool operator==(const DataRef<T>& o) const {
-    ASSERT(m_data);
-    ASSERT(o.m_data);
+    DCHECK(m_data);
+    DCHECK(o.m_data);
     return m_data == o.m_data || *m_data == *o.m_data;
   }
 
   bool operator!=(const DataRef<T>& o) const {
-    ASSERT(m_data);
-    ASSERT(o.m_data);
+    DCHECK(m_data);
+    DCHECK(o.m_data);
     return m_data != o.m_data && *m_data != *o.m_data;
   }