Don't delete g_vlog_info

Fixes a race on startup. See issue for details.

BUG=chromium-os:20865
TEST=Ensure logging, including VLOG, works.
TBR=willchen@chromium.org

Review URL: http://codereview.chromium.org/8757002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112828 0039d316-1c4b-4281-b951-d872f2087c98

diff --git a/base/logging.h b/base/logging.h
index ae67eac..94a82ad 100644
--- a/base/logging.h
+++ b/base/logging.h

@@ -210,6 +210,10 @@
 // The default log file is initialized to "debug.log" in the application
 // directory. You probably don't want this, especially since the program
 // directory may not be writable on an enduser's system.
+//
+// This function may be called a second time to re-direct logging (e.g after
+// loging in to a user partition), however it should never be called more than
+// twice.
 inline bool InitLogging(const PathChar* log_file,
                         LoggingDestination logging_dest,
                         LogLockingState lock_log,