Add FilePath to base namespace.

chrome/browser/extensions/extension_apitest.h

Index: chrome/browser/extensions/extension_apitest.h
diff --git a/chrome/browser/extensions/extension_apitest.h b/chrome/browser/extensions/extension_apitest.h
index 143f9fd2f2e10c505f07ac731abf52fa09367c82..8d3d2e0ff3e39ed31bf8c252341f9dada86175df 100644
--- a/chrome/browser/extensions/extension_apitest.h
+++ b/chrome/browser/extensions/extension_apitest.h
@@ -13,13 +13,14 @@
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "content/public/browser/notification_registrar.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace extensions {
 class Extension;
 }
 
-
 // The general flow of these API tests should work like this:
 // (1) Setup initial browser state (e.g. create some bookmarks for the
 //     bookmark test)
@@ -158,7 +159,7 @@ class ExtensionApiTest : public ExtensionBrowserTest {
   // Start the test WebSocket server, and store details of its state. Those
   // details will be available to javascript tests using
   // chrome.test.getConfig().
-  bool StartWebSocketServer(const FilePath& root_directory);
+  bool StartWebSocketServer(const base::FilePath& root_directory);
 
   // Test that exactly one extension loaded.  If so, return a pointer to
   // the extension.  If not, return NULL and set message_.