Remove use of PRODUCT_STRING_PATH in chrome_elf.

chrome_elf/blacklist/test/blacklist_test.cc

Index: chrome_elf/blacklist/test/blacklist_test.cc
diff --git a/chrome_elf/blacklist/test/blacklist_test.cc b/chrome_elf/blacklist/test/blacklist_test.cc
index a85f27efd43f3af87780a938f38578cf31d62c86..0f92494c269555c9b08cff31cb3bc1d072c1189d 100644
--- a/chrome_elf/blacklist/test/blacklist_test.cc
+++ b/chrome_elf/blacklist/test/blacklist_test.cc
@@ -191,7 +191,9 @@ class BlacklistTest : public testing::Test {
 
     blacklist_registry_key_.reset(
         new base::win::RegKey(HKEY_CURRENT_USER,
-                              blacklist::kRegistryBeaconPath,
+                              install_static::GetRegistryPath()
+                                  .append(kRegistryBeaconKeyName)
+                                  .c_str(),
                               KEY_QUERY_VALUE | KEY_SET_VALUE));
 
     // Find out how many dlls were blocked before the test starts.