Add FilePath to base namespace.

chrome/installer/util/installer_util_test_common.h

Index: chrome/installer/util/installer_util_test_common.h
diff --git a/chrome/installer/util/installer_util_test_common.h b/chrome/installer/util/installer_util_test_common.h
index 8839f6d030eacdb4c57368bd097a949e13a646ba..0a4096879132fab01ca1cdcca0c145de63624189 100644
--- a/chrome/installer/util/installer_util_test_common.h
+++ b/chrome/installer/util/installer_util_test_common.h
@@ -5,7 +5,9 @@
 #ifndef CHROME_INSTALLER_UTIL_INSTALLER_UTIL_TEST_COMMON_H_
 #define CHROME_INSTALLER_UTIL_INSTALLER_UTIL_TEST_COMMON_H_
 
+namespace base {
 class FilePath;
+}
 
 namespace installer {
 
@@ -13,7 +15,7 @@ namespace test {
 
 // Copies the hierarcy in |from| to |to|.
 // Keeps all file properties identical (creation time, etc.).
-bool CopyFileHierarchy(const FilePath& from, const FilePath& to);
+bool CopyFileHierarchy(const base::FilePath& from, const base::FilePath& to);
 
 }  // namespace test