Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc

Index: third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
diff --git a/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc b/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
index bf4e58319c641c739573b290316619d752df0b47..77451ab1bff81b2377da93af2f661d98021e8630 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
+++ b/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_bootstrap_unittest.cc
@@ -99,6 +99,7 @@ class MockGeneratorContext : public GeneratorContext {
                           &actual_contents, true));
     EXPECT_TRUE(actual_contents == *expected_contents)
       << physical_filename << " needs to be regenerated.  Please run "
+         "google/protobuf/compiler/release_compiler.sh and "
          "generate_descriptor_proto.sh. Then add this file "
          "to your CL.";
   }
@@ -114,7 +115,7 @@ class MockGeneratorContext : public GeneratorContext {
   }
 
  private:
-  std::map<string, string*> files_;
+  map<string, string*> files_;
 };
 
 TEST(BootstrapTest, GeneratedDescriptorMatches) {