Move compiler cctests into v8::internal::compiler namespace.

test/cctest/compiler/test-run-bytecode-graph-builder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // TODO(jochen): Remove this after the setting is turned on globally.
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include <utility>
 
 #include "src/compiler/pipeline.h"
@@ skipping 94 matching lines @@
     compiler::Pipeline pipeline(&compilation_info);
     Handle<Code> code = pipeline.GenerateCode();
     function->ReplaceCode(*code);
 
     return function;
   }
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeGraphTester);
 };
 
-}  // namespace compiler
-}  // namespace internal
-}  // namespace v8
-
-
-using namespace v8::internal;
-using namespace v8::internal::compiler;
 
 template <int N>
 struct ExpectedSnippet {
   const char* code_snippet;
   Handle<Object> return_value_and_parameters[N + 1];
 
   inline Handle<Object> return_value() const {
     return return_value_and_parameters[0];
   }
 
@@ skipping 121 matching lines @@
              snippets[i].code_snippet, kFunctionName);
 
     BytecodeGraphTester tester(isolate, zone, script.start());
     auto callable = tester.GetCallable<Handle<Object>, Handle<Object>>();
     Handle<Object> return_value =
         callable(snippets[i].parameter(0), snippets[i].parameter(1))
             .ToHandleChecked();
     CHECK(return_value->SameValue(*snippets[i].return_value()));
   }
 }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8