Make Mac first run store sentinel in Profile directory.

chrome/common/child_process_host.cc

Index: chrome/common/child_process_host.cc
diff --git a/chrome/common/child_process_host.cc b/chrome/common/child_process_host.cc
index 1fa91f993cb9034e102b70d5a73303e2005faf2b..d21899815845fc16971112a0aac92d803cb30879 100644
--- a/chrome/common/child_process_host.cc
+++ b/chrome/common/child_process_host.cc
@@ -31,7 +31,7 @@
 // static string containing the user's unique GUID.  We send this in the crash
 // report.
 namespace google_update {
-extern std::string linux_guid;
+extern std::string posix_guid;
 }  // namespace google_update
 #endif  // OS_LINUX
 
@@ -149,7 +149,7 @@ void ChildProcessHost::SetCrashReporterCommandLine(CommandLine* command_line) {
   if (GoogleUpdateSettings::GetCollectStatsConsent()) {
 #if defined(OS_LINUX)
     command_line->AppendSwitchWithValue(switches::kEnableCrashReporter,
-                                        ASCIIToWide(google_update::linux_guid +
+                                        ASCIIToWide(google_update::posix_guid +
                                                     "," +
                                                     base::GetLinuxDistro()));
 #else  // !OS_LINUX