Remove remaining dependency on test_runner from components.

components/webcrypto/fuzzer_support.cc

 // Copyright 2016 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 "components/webcrypto/fuzzer_support.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/numerics/safe_conversions.h"
-#include "components/test_runner/test_common.h"
 #include "components/webcrypto/algorithm_dispatch.h"
 #include "components/webcrypto/crypto_data.h"
 #include "components/webcrypto/status.h"
+#include "third_party/WebKit/public/platform/Platform.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
+#include "third_party/WebKit/public/web/WebKit.h"
 
 namespace webcrypto {
 
 namespace {
 
 // This mock is used to initialize blink.
-class InitOnce {
+class InitOnce : NON_EXPORTED_BASE(public blink::Platform) {
  public:
   InitOnce() {
-    // EnsureBlinkInitialized() depends on the command line singleton being
-    // initialized.
     base::CommandLine::Init(0, nullptr);
-    test_runner::EnsureBlinkInitialized();
+    blink::Platform::initialize(this);
   }
+  ~InitOnce() override {}
 };
 
 base::LazyInstance<InitOnce>::Leaky g_once = LAZY_INSTANCE_INITIALIZER;
 
 void EnsureInitialized() {
   g_once.Get();
 }
 
 blink::WebCryptoAlgorithm CreateRsaHashedImportAlgorithm(
     blink::WebCryptoAlgorithmId id,
@@ skipping 84 matching lines @@
 
   // These errors imply a bad setup of parameters, and means ImportKey() may not
   // be testing the actual parsing.
   DCHECK_NE(status.error_details(),
             Status::ErrorUnsupportedImportKeyFormat().error_details());
   DCHECK_NE(status.error_details(),
             Status::ErrorCreateKeyBadUsages().error_details());
 }
 
 }  // namespace webcrypto