Change linux default hidden file save directory to XDG_DATA_HOME

chrome/browser/download/download_prefs.cc

Index: chrome/browser/download/download_prefs.cc
diff --git a/chrome/browser/download/download_prefs.cc b/chrome/browser/download/download_prefs.cc
index 9a3b2dea14abf0f6e91355c90d2534d880322cd8..f368c7b33d7c220acf88fe99eaf68a34558101ee 100644
--- a/chrome/browser/download/download_prefs.cc
+++ b/chrome/browser/download/download_prefs.cc
@@ -34,6 +34,10 @@
 #include "content/public/browser/download_manager.h"
 #include "content/public/browser/save_page_type.h"
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+#include "chrome/browser/shell_integration_linux.h"
+#endif
+
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/drive/drive_integration_service.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
@@ -255,6 +259,13 @@ base::FilePath DownloadPrefs::DownloadPath() const {
     if (!integration_service || !integration_service->is_enabled())
       return GetDefaultDownloadDirectoryForProfile();
   }
+#elif defined(OS_LINUX)
+  // TODO(thomasanderson): Remove this when all Linux distros with

[qinmin, 2017/06/07 14:21:18]

This logic would override the |download_path_| set by
DownloadPrefs::SetDownloadPath().
Is this intended? If a test want the download_path_ to be /test/, will that test
fail?

[Tom Anderson, 2017/06/07 18:38:38]

oops.. done.
Hopefully this will fix the test failures

+  // versions of GTK lower than 3.14.7 are no longer supported.  This
+  // should happen when support for Ubuntu Trusty and Debian Jessie
+  // are removed.
+  std::unique_ptr<base::Environment> env(base::Environment::Create());
+  return shell_integration_linux::GetDataWriteLocation(env.get());
 #endif
   return *download_path_;
 }