Replace ASSERT and ASSERT_NOT_REACHED in core/style/

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

Index: third_party/WebKit/Source/core/style/ContentData.h
diff --git a/third_party/WebKit/Source/core/style/ContentData.h b/third_party/WebKit/Source/core/style/ContentData.h
index 0b25bccf652d5057debb93c9494df3c5626ec509..c99dbd35b2ea06156bf4db04d648950f469de478 100644
--- a/third_party/WebKit/Source/core/style/ContentData.h
+++ b/third_party/WebKit/Source/core/style/ContentData.h
@@ -79,7 +79,7 @@ class ImageContentData final : public ContentData {
   const StyleImage* image() const { return m_image.get(); }
   StyleImage* image() { return m_image.get(); }
   void setImage(StyleImage* image) {
-    ASSERT(image);
+    DCHECK(image);
     m_image = image;
   }
 
@@ -95,7 +95,7 @@ class ImageContentData final : public ContentData {
   DECLARE_VIRTUAL_TRACE();
 
  private:
-  ImageContentData(StyleImage* image) : m_image(image) { ASSERT(m_image); }
+  ImageContentData(StyleImage* image) : m_image(image) { DCHECK(m_image); }
 
   ContentData* cloneInternal() const override {
     StyleImage* image = const_cast<StyleImage*>(this->image());