Be explicit about namespace testing to not mix it with blink::testing

third_party/WebKit/Source/platform/blob/BlobDataTest.cpp

 // Copyright 2015 The Chromium 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 "platform/blob/BlobData.h"
 
 #include <memory>
 #include <utility>
 #include "base/test/scoped_task_environment.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
@@ skipping 172 matching lines @@
                               uint64_t offset,
                               uint64_t length) {
     return ExpectedElement{
         DataElement::NewBlob(DataElementBlob::New(nullptr, offset, length)),
         uuid};
   }
 };
 
 }  // namespace
 
-class BlobDataHandleTest : public testing::Test {
+class BlobDataHandleTest : public ::testing::Test {
  public:
   BlobDataHandleTest()
       : enable_mojo_blobs_(true), testing_platform_(&mock_blob_registry_) {}
 
   void SetUp() override {
     small_test_data_.resize(1024);
     medium_test_data_.resize(1024 * 32);
     large_test_data_.resize(1024 * 512);
     for (size_t i = 0; i < small_test_data_.size(); ++i)
       small_test_data_[i] = i;
@@ skipping 342 matching lines @@
   expected_elements.push_back(
       ExpectedElement::LargeBytes(std::move(merged_data)));
   expected_elements.push_back(ExpectedElement::Blob(test_blob_uuid_, 0, 10));
   expected_elements.push_back(
       ExpectedElement::EmbeddedBytes(medium_test_data_));
 
   TestCreateBlob(std::move(data), std::move(expected_elements));
 }
 
 }  // namespace blink