Replace FilePath with base::FilePath.

content/public/browser/web_contents_observer.h

Index: content/public/browser/web_contents_observer.h
diff --git a/content/public/browser/web_contents_observer.h b/content/public/browser/web_contents_observer.h
index f58f57d4a8eeacaefa0f5c22fd4130fff25223a0..a66e428ceebf6d7ba6c604178eb248a971f66c7f 100644
--- a/content/public/browser/web_contents_observer.h
+++ b/content/public/browser/web_contents_observer.h
@@ -209,7 +209,7 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
   // this ID is supplied by the renderer, so should not be trusted. Besides, the
   // corresponding process has probably died at this point. The ID may even have
   // been reused by a new process.
-  virtual void PluginCrashed(const FilePath& plugin_path,
+  virtual void PluginCrashed(const base::FilePath& plugin_path,
                              base::ProcessId plugin_pid) {}
 
   // Notication that the given plugin has hung or become unhung. This
@@ -219,7 +219,7 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
   // that this ID is supplied by the renderer, so should be validated before
   // it's used for anything in case there's an exploited renderer.
   virtual void PluginHungStatusChanged(int plugin_child_id,
-                                       const FilePath& plugin_path,
+                                       const base::FilePath& plugin_path,
                                        bool is_hung) {}
 
   // Invoked when WebContents::Clone() was used to clone a WebContents.