Add a GetRegistryPath method to BrowserDistribution.

chrome/installer/util/browser_distribution.h

Index: chrome/installer/util/browser_distribution.h
diff --git a/chrome/installer/util/browser_distribution.h b/chrome/installer/util/browser_distribution.h
index 4b4c294bc16068fe52db047f6185dd477435dc87..a9ca14642301395e2b936eee949e35e3f1485eb9 100644
--- a/chrome/installer/util/browser_distribution.h
+++ b/chrome/installer/util/browser_distribution.h
@@ -131,6 +131,10 @@ class BrowserDistribution {
   virtual base::string16 GetDistributionData(HKEY root_key);
 #endif
 
+  // Returns the registry path under which registry keys for this distribution

[grt (UTC plus 2), 2015/11/26 15:33:34]

How about documenting the contract for this key a bit more explicitly. What do
you think of:

  // Returns the path "Software\<PRODUCT>". This subkey of HKEY_CURRENT_USER can
  // be used to save and restore state. With the exception of data that is used
  // by third parties (e.g., a subkey that specifies the location of a native
  // messaging host's manifest), state stored in this key is removed during
  // uninstall when the user chooses to also delete their browsing data.

[fdoray, 2015/11/26 18:54:03]

Done.

+  // should reside.
+  base::string16 GetRegistryPath();
+
   virtual base::string16 GetUninstallRegPath();
 
   // Returns an enum specifying the different ways in which this distribution