Revert of SegmentedString::push() should always push a char in front

Source/core/html/parser/HTMLEntityParserTest.cpp

Index: Source/core/html/parser/HTMLEntityParserTest.cpp
diff --git a/Source/core/html/parser/HTMLEntityParserTest.cpp b/Source/core/html/parser/HTMLEntityParserTest.cpp
deleted file mode 100644
index be460d97af72c851561e9cf50b447659489f40bf..0000000000000000000000000000000000000000
--- a/Source/core/html/parser/HTMLEntityParserTest.cpp
+++ /dev/null
@@ -1,27 +0,0 @@
-// 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 "config.h"
-#include "core/html/parser/HTMLEntityParser.h"
-
-#include <gtest/gtest.h>
-
-namespace blink {
-
-TEST(HTMLEntityParserTest, ConsumeHTMLEntityIncomplete)
-{
-    String original("am"); // Incomplete by purpose.
-    SegmentedString src(original);
-
-    DecodedHTMLEntity entity;
-    bool notEnoughCharacters;
-    bool success = consumeHTMLEntity(src, entity, notEnoughCharacters);
-    EXPECT_TRUE(notEnoughCharacters);
-    EXPECT_FALSE(success);
-
-    // consumeHTMLEntity should recover the original SegmentedString state if failed.
-    EXPECT_STREQ(original.ascii().data(), src.toString().ascii().data());
-}
-
-} // namespace blink