Add OS_CHROMEOS case in file_util::GetHomeDir()

base/chromeos/chromeos_version.h

Index: base/chromeos/chromeos_version.h
diff --git a/base/chromeos/chromeos_version.h b/base/chromeos/chromeos_version.h
index 25acd43a9f0867357f7eaa3adabc892a8c5f24ab..fa956829de316a8625c4d47a7e5e9db5e71a81c3 100644
--- a/base/chromeos/chromeos_version.h
+++ b/base/chromeos/chromeos_version.h
@@ -5,6 +5,8 @@
 #ifndef BASE_CHROMEOS_CHROMEOS_VERSION_H_
 #define BASE_CHROMEOS_CHROMEOS_VERSION_H_
 
+#include <string>
+
 #include "base/base_export.h"
 
 namespace base {
@@ -14,6 +16,10 @@ namespace chromeos {
 // Useful for implementing stubs for Linux desktop.
 BASE_EXPORT bool IsRunningOnChromeOS();
 
+// Returns the home directory path, or an empty string if the home directory
+// is not found.
+BASE_EXPORT std::string GetHomeDirectory();
+
 }  // namespace chromeos
 }  // namespace base