Revert of Cast device revocation checking.

components/cast_certificate/cast_cert_validator_test_helpers.cc

Index: components/cast_certificate/cast_cert_validator_test_helpers.cc
diff --git a/components/cast_certificate/cast_cert_validator_test_helpers.cc b/components/cast_certificate/cast_cert_validator_test_helpers.cc
index a854abd8c185058a0ef64c4009b0872566d20a82..78c092b1e6ebcbdd58db013b0f52140a73537810 100644
--- a/components/cast_certificate/cast_cert_validator_test_helpers.cc
+++ b/components/cast_certificate/cast_cert_validator_test_helpers.cc
@@ -13,6 +13,10 @@
 
 namespace testing {
 
+namespace {
+
+// Reads a file from the test data directory
+// (//src/components/test/data/cast_certificate)
 std::string ReadTestFileToString(const base::StringPiece& file_name) {
   base::FilePath filepath;
   PathService::Get(base::DIR_SOURCE_ROOT, &filepath);
@@ -31,6 +35,8 @@
 
   return file_data;
 }
+
+}  // namespace
 
 std::vector<std::string> ReadCertificateChainFromFile(
     const base::StringPiece& file_name) {