Refactor SetOmahaExperimentLabel out of gcpai and into install_util.

chrome/installer/gcapi/gcapi.cc

Index: chrome/installer/gcapi/gcapi.cc
diff --git a/chrome/installer/gcapi/gcapi.cc b/chrome/installer/gcapi/gcapi.cc
index 1b52694dad73e117b9fb0b0dca0a845fc3dd2fe3..e627fcfd10b20f06f94d22be3124b1fab0421e7f 100644
--- a/chrome/installer/gcapi/gcapi.cc
+++ b/chrome/installer/gcapi/gcapi.cc
@@ -629,7 +629,7 @@ BOOL __stdcall ReactivateChrome(wchar_t* brand_code,
     if (SetReactivationBrandCode(brand_code, shell_mode)) {
       // Currently set this as a best-effort thing. We return TRUE if
       // reactivation succeeded regardless of the experiment label result.
-      SetOmahaExperimentLabel(brand_code, shell_mode);
+      SetReactivationExperimentLabels(brand_code, shell_mode);
 
       result = TRUE;
     } else {
@@ -640,4 +640,3 @@ BOOL __stdcall ReactivateChrome(wchar_t* brand_code,
 
   return result;
 }
-