TestingPlatformSupport: register Platform instance correctly

third_party/WebKit/Source/platform/fonts/FontCacheTest.cpp

 // Copyright 2014 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/fonts/FontCache.h"
 
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/testing/TestingPlatformSupport.h"
 #include "public/platform/Platform.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
-class EmptyPlatform : public TestingPlatformSupport {
- public:
-  EmptyPlatform() {}
-  ~EmptyPlatform() override {}
-};
-
 TEST(FontCache, getLastResortFallbackFont) {
   FontCache* fontCache = FontCache::fontCache();
   ASSERT_TRUE(fontCache);
 
-  EmptyPlatform platform;
-
   FontDescription fontDescription;
   fontDescription.setGenericFamily(FontDescription::StandardFamily);
   RefPtr<SimpleFontData> fontData =
       fontCache->getLastResortFallbackFont(fontDescription, Retain);
   EXPECT_TRUE(fontData);
 
   fontDescription.setGenericFamily(FontDescription::SansSerifFamily);
   fontData = fontCache->getLastResortFallbackFont(fontDescription, Retain);
   EXPECT_TRUE(fontData);
 }
@@ skipping 12 matching lines @@
 
   EXPECT_EQ("not exist",
             FontCache::firstAvailableOrFirst("not exist, not exist 2"));
 
   EXPECT_EQ("Arial", FontCache::firstAvailableOrFirst(", not exist, Arial"));
   EXPECT_EQ("not exist",
             FontCache::firstAvailableOrFirst(", not exist, not exist"));
 }
 
 }  // namespace blink