Rewrite references to "wtf/" to "platform/wtf/" in core/paint.

third_party/WebKit/Source/core/paint/FirstMeaningfulPaintDetectorTest.cpp

 // 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 "core/paint/FirstMeaningfulPaintDetector.h"
 
 #include "core/paint/PaintTiming.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/testing/TestingPlatformSupport.h"
+#include "platform/wtf/text/StringBuilder.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 class FirstMeaningfulPaintDetectorTest : public testing::Test {
  protected:
   void SetUp() override {
     platform_->AdvanceClockSeconds(1);
     dummy_page_holder_ = DummyPageHolder::Create(IntSize(800, 600));
   }
 
@@ skipping 221 matching lines @@
   platform_->RunForPeriodSeconds(kNetwork2QuietWindowSeconds - 0.1);
   EXPECT_TRUE(IsNetwork2QuietTimerActive());
   EXPECT_FALSE(HadNetwork2Quiet());
 
   SetActiveConnections(1);  // This should not reset the 2-quiet timer.
   platform_->RunForPeriodSeconds(0.1001);
   EXPECT_TRUE(HadNetwork2Quiet());
 }
 
 }  // namespace blink