Add FilePath to base namespace.

chrome/test/chromedriver/chrome_launcher.h

Index: chrome/test/chromedriver/chrome_launcher.h
diff --git a/chrome/test/chromedriver/chrome_launcher.h b/chrome/test/chromedriver/chrome_launcher.h
index a0caa1ac024ff02a2d0211e967e2793999d77746..3763d2c823a4b3696de9bc895b5fc134a8e49d0c 100644
--- a/chrome/test/chromedriver/chrome_launcher.h
+++ b/chrome/test/chromedriver/chrome_launcher.h
@@ -8,9 +8,12 @@
 #include "base/memory/scoped_ptr.h"
 
 class Chrome;
-class FilePath;
 class Status;
 
+namespace base {
+class FilePath;
+}
+
 // Launches Chrome. Must be thread safe.
 class ChromeLauncher {
  public:
@@ -18,7 +21,7 @@ class ChromeLauncher {
 
   // Launches Chrome found at the given path. If the path
   // is empty, the default Chrome binary is to be used.
-  virtual Status Launch(const FilePath& chrome_exe,
+  virtual Status Launch(const base::FilePath& chrome_exe,
                         scoped_ptr<Chrome>* chrome) = 0;
 };