[cros] RLZ tracking can be turned off via a flag file.

chrome/browser/google/google_util_chromeos.h

Index: chrome/browser/google/google_util_chromeos.h
diff --git a/chrome/browser/google/google_util_chromeos.h b/chrome/browser/google/google_util_chromeos.h
index 94443ee30dfc8633707f60a8762a93fdaac6ed91..734eb5ba88f68605da88f64b4bba1aa851783b5f 100644
--- a/chrome/browser/google/google_util_chromeos.h
+++ b/chrome/browser/google/google_util_chromeos.h
@@ -16,6 +16,10 @@ namespace chromeos {
 // partner. Returns empty string if the information is not available.
 std::string GetBrand();
 
+// Sets brand for current session only, i.e. not persisted through browser
+// restart. Future calls to GetBrand() will return |brand|.
+void SetBrandForCurrentSession(const std::string& brand);

[Ilya Sherman, 2012/12/15 00:57:16]

It looks like you only ever use this method to set an empty brand code.  If I'm
understanding that correctly, it would be better to narrow the API to only
support clearing out the brand code, rather than being able to set an arbitrary
one (which I found quite surprising upon first encounter.)

[Ivan Korotkov, 2012/12/17 09:05:01]

Makes sense. I wanted to be as generic as possible but it's unlikely there'll
ever be another use for this function. Done.

+
 // Reads the brand code from a board-specific file and stores it to Local State.
 // |callback| is invoked on the calling thread after that.
 void SetBrandFromFile(const base::Closure& callback);