Linux: Change ShellIntegration code to use GetXDGDirectory().

chrome/browser/shell_integration_linux.h

Index: chrome/browser/shell_integration_linux.h
diff --git a/chrome/browser/shell_integration_linux.h b/chrome/browser/shell_integration_linux.h
index 90808b6be05b55b7bb16fb6e2874924a2c2da321..9899c3e4f5485516ed8e6b750932416bf4c8d6ee 100644
--- a/chrome/browser/shell_integration_linux.h
+++ b/chrome/browser/shell_integration_linux.h
@@ -22,9 +22,8 @@ namespace shell_integration_linux {
 // Get the path to write user-specific application data files to, as specified
 // in the XDG Base Directory Specification:
 // http://standards.freedesktop.org/basedir-spec/latest/
-// Returns true on success, or false if no such path could be found.
 // Called on the FILE thread.
-bool GetDataWriteLocation(base::Environment* env, base::FilePath* search_path);
+base::FilePath GetDataWriteLocation(base::Environment* env);
 
 // Get the list of paths to search for application data files, in order of
 // preference, as specified in the XDG Base Directory Specification: