Add FilePath to base namespace.

win8/delegate_execute/chrome_util.h

Index: win8/delegate_execute/chrome_util.h
diff --git a/win8/delegate_execute/chrome_util.h b/win8/delegate_execute/chrome_util.h
index 634ce6c0fcbd0ef76183a2f29df4f1a8ad805479..f65ec2fddf3bf8278b3eb179679e1cf4be480883 100644
--- a/win8/delegate_execute/chrome_util.h
+++ b/win8/delegate_execute/chrome_util.h
@@ -7,15 +7,17 @@
 
 #include "base/string16.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace delegate_execute {
 
 // Finalizes a previously updated installation.
-void UpdateChromeIfNeeded(const FilePath& chrome_exe);
+void UpdateChromeIfNeeded(const base::FilePath& chrome_exe);
 
 // Returns the appid of the Chrome pointed to by |chrome_exe|.
-string16 GetAppId(const FilePath& chrome_exe);
+string16 GetAppId(const base::FilePath& chrome_exe);
 
 }  // namespace delegate_execute