Add FilePath to base namespace.

chrome/browser/google_apis/drive_api_service.h

Index: chrome/browser/google_apis/drive_api_service.h
diff --git a/chrome/browser/google_apis/drive_api_service.h b/chrome/browser/google_apis/drive_api_service.h
index 45876d1ca31db228296f59cd133bd798d7411422..4da956832716b9694eb29276123fba145bf3411f 100644
--- a/chrome/browser/google_apis/drive_api_service.h
+++ b/chrome/browser/google_apis/drive_api_service.h
@@ -14,10 +14,13 @@
 #include "chrome/browser/google_apis/drive_api_url_generator.h"
 #include "chrome/browser/google_apis/drive_service_interface.h"
 
-class FilePath;
 class GURL;
 class Profile;
 
+namespace base {
+class FilePath;
+}
+
 namespace net {
 class URLRequestContextGetter;
 }  // namespace net
@@ -51,7 +54,7 @@ class DriveAPIService : public DriveServiceInterface,
   virtual void RemoveObserver(DriveServiceObserver* observer) OVERRIDE;
   virtual bool CanStartOperation() const OVERRIDE;
   virtual void CancelAll() OVERRIDE;
-  virtual bool CancelForFilePath(const FilePath& file_path) OVERRIDE;
+  virtual bool CancelForFilePath(const base::FilePath& file_path) OVERRIDE;
   virtual OperationProgressStatusList GetProgressStatusList() const OVERRIDE;
   virtual bool HasAccessToken() const OVERRIDE;
   virtual bool HasRefreshToken() const OVERRIDE;
@@ -74,8 +77,8 @@ class DriveAPIService : public DriveServiceInterface,
       const std::string& resource_id,
       const EntryActionCallback& callback) OVERRIDE;
   virtual void DownloadFile(
-      const FilePath& virtual_path,
-      const FilePath& local_cache_path,
+      const base::FilePath& virtual_path,
+      const base::FilePath& local_cache_path,
       const GURL& content_url,
       const DownloadActionCallback& download_action_callback,
       const GetContentCallback& get_content_callback) OVERRIDE;