Refactor SetClientID such that metrics rather than crash backs up the client id in Google Update set

chrome/common/crash_keys.h

Index: chrome/common/crash_keys.h
diff --git a/chrome/common/crash_keys.h b/chrome/common/crash_keys.h
index dd378fb95d0dadf7640a2825fa07b5e5e1873a4a..4b032b73ec314ec5c9bb8f749e7dd27e2d56de42 100644
--- a/chrome/common/crash_keys.h
+++ b/chrome/common/crash_keys.h
@@ -21,8 +21,9 @@ namespace crash_keys {
 // reporting server. Returns the size of the union of all keys.
 size_t RegisterChromeCrashKeys();
 
-// Sets the GUID by which this crash reporting client can be identified.
-void SetClientID(const std::string& client_id);
+// Sets the ID (based on |client_guid|) by which this crash reporting client can
+// be identified.
+void SetClientIDFromGUID(const std::string& client_guid);
 
 // Sets the kSwitch and kNumSwitches keys based on the given |command_line|.
 void SetSwitchesFromCommandLine(const base::CommandLine* command_line);