Remove using directives ("using namespace x") from testing/.

Bug: 82078
Change-Id: Id6acded56ab6c6e4133a274875db985e963fcf8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1820539
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699221}

testing/libfuzzer/fuzzers/url_parse_proto_fuzzer.cc

@@ -33,14 +33,12 @@ TestCase* test_case = new TestCase();
 // Silence logging from the protobuf library.
 protobuf_mutator::protobuf::LogSilencer log_silencer;
 
-using namespace url_parse_proto_fuzzer;
-
 std::string Slash_to_string(int slash) {
-  if (slash == Url::NONE)
+  if (slash == url_parse_proto_fuzzer::Url::NONE)
     return "";
-  if (slash == Url::FORWARD)
+  if (slash == url_parse_proto_fuzzer::Url::FORWARD)
     return "/";
-  if (slash == Url::BACKWARD) {
+  if (slash == url_parse_proto_fuzzer::Url::BACKWARD) {
     return "\\";
   }
   assert(false && "Received unexpected value for slash");
@@ -52,7 +50,7 @@ std::string Slash_to_string(int slash) {
 // Since protobuf is a relatively simple format, fuzzing targets that do not
 // accept protobufs (such as this one) will require code to convert from
 // protobuf to the accepted format (string in this case).
-std::string protobuf_to_string(const Url& url) {
+std::string protobuf_to_string(const url_parse_proto_fuzzer::Url& url) {
   // Build url_string piece by piece from url and then return it.
   std::string url_string = std::string("");
 
@@ -128,7 +126,7 @@ std::string protobuf_to_string(const Url& url) {
 // typical libFuzzer based fuzzers. It is passed our Url protobuf object that
 // was mutated by libFuzzer, converts it to a string and then feeds it to url()
 // for fuzzing.
-DEFINE_BINARY_PROTO_FUZZER(const Url& url_protobuf) {
+DEFINE_BINARY_PROTO_FUZZER(const url_parse_proto_fuzzer::Url& url_protobuf) {
   std::string url_string = protobuf_to_string(url_protobuf);
 
   // Allow native input to be retrieved easily.

testing/libfuzzer/proto/json_proto_converter.cc

@@ -4,7 +4,7 @@
 
 #include "testing/libfuzzer/proto/json_proto_converter.h"
 
-using namespace json_proto;
+namespace json_proto {
 
 void JsonProtoConverter::AppendArray(const ArrayValue& array_value) {
   data_ << '[';
@@ -65,3 +65,5 @@ std::string JsonProtoConverter::Convert(const JsonObject& json_object) {
   AppendObject(json_object);
   return data_.str();
 }
+
+}  // namespace json_proto