Add FilePath to base namespace.

sql/connection.h

Index: sql/connection.h
diff --git a/sql/connection.h b/sql/connection.h
index 2722ffdc7f9d51557090b2300d1514135b9737bd..fa7c99da7c5eaee7f57769acaae0acbef8357522 100644
--- a/sql/connection.h
+++ b/sql/connection.h
@@ -17,10 +17,13 @@
 #include "base/time.h"
 #include "sql/sql_export.h"
 
-class FilePath;
 struct sqlite3;
 struct sqlite3_stmt;
 
+namespace base {
+class FilePath;
+}
+
 namespace sql {
 
 class Statement;
@@ -154,7 +157,7 @@ class SQL_EXPORT Connection {
 
   // Initializes the SQL connection for the given file, returning true if the
   // file could be opened. You can call this or OpenInMemory.
-  bool Open(const FilePath& path) WARN_UNUSED_RESULT;
+  bool Open(const base::FilePath& path) WARN_UNUSED_RESULT;
 
   // Initializes the SQL connection for a temporary in-memory database. There
   // will be no associated file on disk, and the initial database will be