Revert of Fix null dereference on MemoryCache.

third_party/WebKit/Source/core/fetch/StyleSheetResource.h

Index: third_party/WebKit/Source/core/fetch/StyleSheetResource.h
diff --git a/third_party/WebKit/Source/core/fetch/StyleSheetResource.h b/third_party/WebKit/Source/core/fetch/StyleSheetResource.h
index 51c8567cbc5e800ab77edcae790ea8535d8c3019..0b9fb40588fc7b1ef98ee388ddd2a9c11c0d0033 100644
--- a/third_party/WebKit/Source/core/fetch/StyleSheetResource.h
+++ b/third_party/WebKit/Source/core/fetch/StyleSheetResource.h
@@ -31,14 +31,13 @@
 #ifndef StyleSheetResource_h
 #define StyleSheetResource_h
 
-#include "core/CoreExport.h"
 #include "core/fetch/TextResource.h"
 
 namespace blink {
 
 class StyleSheetResourceClient;
 
-class CORE_EXPORT StyleSheetResource : public TextResource {
+class StyleSheetResource : public TextResource {
 public:
     using ClientType = StyleSheetResourceClient;