Remove test stdout spam

Change-Id: Ie7c14274509a88f9c1aebcf9d12df39ba3d2dafe
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/53807
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: David Neto <dneto@google.com>

src/reader/spirv/function_memory_test.cc

@@ -851,7 +851,6 @@ TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_DereferenceBase) {
      OpFunctionEnd
   )";
   auto p = parser(test::Assemble(assembly));
-  std::cout << assembly << std::endl;
   ASSERT_TRUE(p->BuildAndParseInternalModule());
   const auto got = p->program().to_str();
   const std::string expected = R"(Module{