prune down content_dll change to just the CONTENT_EXPORTS

content/browser/download/base_file.h

Index: content/browser/download/base_file.h
diff --git a/content/browser/download/base_file.h b/content/browser/download/base_file.h
index ff119d4c7403bf99357d612ab9a54ca145eded86..7c3333ce37835484a27260df303c5e760e5aaaf4 100644
--- a/content/browser/download/base_file.h
+++ b/content/browser/download/base_file.h
@@ -12,6 +12,7 @@
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/power_save_blocker.h"
+#include "content/common/content_export.h"
 #include "googleurl/src/gurl.h"
 
 namespace crypto {
@@ -23,7 +24,7 @@ class FileStream;
 
 // File being downloaded and saved to disk. This is a base class
 // for DownloadFile and SaveFile, which keep more state information.
-class BaseFile {
+class CONTENT_EXPORT BaseFile {
  public:
   BaseFile(const FilePath& full_path,
            const GURL& source_url,