Add explicit base to FilePath.

content/shell/shell_render_process_observer.h

Index: content/shell/shell_render_process_observer.h
diff --git a/content/shell/shell_render_process_observer.h b/content/shell/shell_render_process_observer.h
index 1f8932d2c1422d708295e6027f07b160f9c17408..4a487e0494a0140ef5d8a7d9483229485fbc4b20 100644
--- a/content/shell/shell_render_process_observer.h
+++ b/content/shell/shell_render_process_observer.h
@@ -44,18 +44,18 @@ class ShellRenderProcessObserver : public RenderProcessObserver {
     return test_delegate_;
   }
   WebKitTestRunner* main_test_runner() const { return main_test_runner_; }
-  const FilePath& webkit_source_dir() const { return webkit_source_dir_; }
+  const base::FilePath& webkit_source_dir() const { return webkit_source_dir_; }
 
  private:
   // Message handlers.
   void OnResetAll();
-  void OnSetWebKitSourceDir(const FilePath& webkit_source_dir);
+  void OnSetWebKitSourceDir(const base::FilePath& webkit_source_dir);
 
   RenderView* main_render_view_;
   WebKitTestRunner* main_test_runner_;
   WebTestRunner::WebTestDelegate* test_delegate_;
 
-  FilePath webkit_source_dir_;
+  base::FilePath webkit_source_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellRenderProcessObserver);
 };