Add FilePath to base namespace.

printing/pdf_metafile_cg_mac.h

Index: printing/pdf_metafile_cg_mac.h
diff --git a/printing/pdf_metafile_cg_mac.h b/printing/pdf_metafile_cg_mac.h
index 09fad5667902765774eca0b3f292749dba80244b..f4dd81acf8166ff48a07ca4084892f2f053b55d9 100644
--- a/printing/pdf_metafile_cg_mac.h
+++ b/printing/pdf_metafile_cg_mac.h
@@ -14,7 +14,9 @@
 #include "base/threading/thread_checker.h"
 #include "printing/metafile.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace gfx {
 class Rect;
@@ -48,7 +50,7 @@ class PRINTING_EXPORT PdfMetafileCg : public Metafile {
   virtual bool GetData(void* dst_buffer, uint32 dst_buffer_size) const OVERRIDE;
 
   // For testing purposes only.
-  virtual bool SaveTo(const FilePath& file_path) const OVERRIDE;
+  virtual bool SaveTo(const base::FilePath& file_path) const OVERRIDE;
 
   virtual gfx::Rect GetPageBounds(unsigned int page_number) const OVERRIDE;
   virtual unsigned int GetPageCount() const OVERRIDE;