Revert of Add operator<< to StyleDifference for debug logging.

third_party/WebKit/Source/core/style/StyleDifferenceTest.cpp

Index: third_party/WebKit/Source/core/style/StyleDifferenceTest.cpp
diff --git a/third_party/WebKit/Source/core/style/StyleDifferenceTest.cpp b/third_party/WebKit/Source/core/style/StyleDifferenceTest.cpp
deleted file mode 100644
index 5fdb6ed3e2f05e90ca67746a60c479a6812bf1d9..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/style/StyleDifferenceTest.cpp
+++ /dev/null
@@ -1,68 +0,0 @@
-// Copyright 2017 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/style/StyleDifference.h"
-
-#include <sstream>
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace blink {
-
-TEST(StyleDifferenceTest, StreamOutputDefault) {
-  std::stringstream stringStream;
-  StyleDifference diff;
-  stringStream << diff;
-  EXPECT_EQ(
-      "StyleDifference{layoutType=NoLayout, "
-      "paintInvalidationType=NoPaintInvalidation, recomputeOverflow=0, "
-      "visualRectUpdate=0, propertySpecificDifferences=}",
-      stringStream.str());
-}
-
-TEST(StyleDifferenceTest, StreamOutputAllFieldsMutated) {
-  std::stringstream stringStream;
-  StyleDifference diff;
-  diff.setNeedsPaintInvalidationObject();
-  diff.setNeedsPositionedMovementLayout();
-  diff.setNeedsRecomputeOverflow();
-  diff.setNeedsVisualRectUpdate();
-  diff.setTransformChanged();
-  diff.setScrollAnchorDisablingPropertyChanged();
-  stringStream << diff;
-  EXPECT_EQ(
-      "StyleDifference{layoutType=PositionedMovement, "
-      "paintInvalidationType=PaintInvalidationObject, recomputeOverflow=1, "
-      "visualRectUpdate=1, "
-      "propertySpecificDifferences=TransformChanged|"
-      "ScrollAnchorDisablingPropertyChanged|TransformChanged|"
-      "ScrollAnchorDisablingPropertyChanged}",
-      stringStream.str());
-}
-
-TEST(StyleDifferenceTest, StreamOutputSetAllProperties) {
-  std::stringstream stringStream;
-  StyleDifference diff;
-  diff.setTransformChanged();
-  diff.setOpacityChanged();
-  diff.setZIndexChanged();
-  diff.setFilterChanged();
-  diff.setBackdropFilterChanged();
-  diff.setCSSClipChanged();
-  diff.setTextDecorationOrColorChanged();
-  diff.setScrollAnchorDisablingPropertyChanged();
-  stringStream << diff;
-  EXPECT_EQ(
-      "StyleDifference{layoutType=NoLayout, "
-      "paintInvalidationType=NoPaintInvalidation, recomputeOverflow=0, "
-      "visualRectUpdate=0, "
-      "propertySpecificDifferences=TransformChanged|OpacityChanged|"
-      "ZIndexChanged|FilterChanged|BackdropFilterChanged|CSSClipChanged|"
-      "TextDecorationOrColorChanged|ScrollAnchorDisablingPropertyChanged|"
-      "TransformChanged|OpacityChanged|ZIndexChanged|FilterChanged|"
-      "BackdropFilterChanged|CSSClipChanged|TextDecorationOrColorChanged|"
-      "ScrollAnchorDisablingPropertyChanged}",
-      stringStream.str());
-}
-
-}  // namespace blink