[presubmit] Enable readability/namespace linter checking.

test/unittests/compiler/register-allocator-unittest.cc

 // Copyright 2014 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.
 
 #include "src/compiler/pipeline.h"
 #include "test/unittests/compiler/instruction-sequence-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 57 matching lines @@
     if (move->IsEliminated() || move->IsRedundant()) continue;
     if (AllocatedOperandMatches(AllocatedOperand::cast(move->source()), src) &&
         AllocatedOperandMatches(AllocatedOperand::cast(move->destination()),
                                 dest)) {
       found_match = true;
       break;
     }
   }
   return found_match;
 }
-}
+
+}  // namespace
 
 
 class RegisterAllocatorTest : public InstructionSequenceTest {
  public:
   void Allocate() {
     WireBlocks();
     Pipeline::AllocateRegistersForTesting(config(), sequence(), true);
   }
 };
 
@@ skipping 626 matching lines @@
 
  protected:
   ParameterType parameter_type() const {
     return ::testing::get<0>(B::GetParam());
   }
   int variant() const { return ::testing::get<1>(B::GetParam()); }
 
  private:
   typedef ::testing::WithParamInterface<::testing::tuple<ParameterType, int>> B;
 };
-}
+
+}  // namespace
 
 
 #if GTEST_HAS_COMBINE
 
 TEST_P(SlotConstraintTest, SlotConstraint) {
   StartBlock();
   VReg p_0;
   switch (parameter_type()) {
     case ParameterType::kFixedSlot:
       p_0 = Parameter(Slot(-1));
@@ skipping 39 matching lines @@
 INSTANTIATE_TEST_CASE_P(
     RegisterAllocatorTest, SlotConstraintTest,
     ::testing::Combine(::testing::ValuesIn(kParameterTypes),
                        ::testing::Range(0, SlotConstraintTest::kMaxVariant)));
 
 #endif  // GTEST_HAS_COMBINE
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8