Remove support of nonstandard 'CSSValueCenter' property value for floated element.

Source/core/css/parser/CSSParserFastPaths.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 "config.h"
 #include "core/css/parser/CSSParserFastPaths.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSValuePool.h"
@@ skipping 192 matching lines @@
         return valueID == CSSValueLtr || valueID == CSSValueRtl;
     case CSSPropertyDisplay:
         // inline | block | list-item | inline-block | table |
         // inline-table | table-row-group | table-header-group | table-footer-group | table-row |
         // table-column-group | table-column | table-cell | table-caption | -webkit-box | -webkit-inline-box | none
         // flex | inline-flex | -webkit-flex | -webkit-inline-flex | grid | inline-grid
         return (valueID >= CSSValueInline && valueID <= CSSValueInlineFlex) || valueID == CSSValueWebkitFlex || valueID == CSSValueWebkitInlineFlex || valueID == CSSValueNone
             || (RuntimeEnabledFeatures::cssGridLayoutEnabled() && (valueID == CSSValueGrid || valueID == CSSValueInlineGrid));
     case CSSPropertyEmptyCells: // show | hide
         return valueID == CSSValueShow || valueID == CSSValueHide;
-    case CSSPropertyFloat: // left | right | none | center (for buggy CSS, maps to none)
-        return valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueNone || valueID == CSSValueCenter;
+    case CSSPropertyFloat: // left | right | none
+        return valueID == CSSValueLeft || valueID == CSSValueRight || valueID == CSSValueNone;
     case CSSPropertyFontStyle: // normal | italic | oblique
         return valueID == CSSValueNormal || valueID == CSSValueItalic || valueID == CSSValueOblique;
     case CSSPropertyFontStretch: // normal | ultra-condensed | extra-condensed | condensed | semi-condensed | semi-expanded | expanded | extra-expanded | ultra-expanded
         return valueID == CSSValueNormal || (valueID >= CSSValueUltraCondensed && valueID <= CSSValueUltraExpanded);
     case CSSPropertyImageRendering: // auto | optimizeContrast | pixelated
         return valueID == CSSValueAuto || valueID == CSSValueWebkitOptimizeContrast || (RuntimeEnabledFeatures::imageRenderingPixelatedEnabled() && valueID == CSSValuePixelated);
     case CSSPropertyIsolation: // auto | isolate
         ASSERT(RuntimeEnabledFeatures::cssCompositingEnabled());
         return valueID == CSSValueAuto || valueID == CSSValueIsolate;
     case CSSPropertyListStylePosition: // inside | outside
@@ skipping 438 matching lines @@
     if (RefPtrWillBeRawPtr<CSSValue> color = parseColorValue(propertyID, string, parserMode))
         return color.release();
     if (RefPtrWillBeRawPtr<CSSValue> keyword = parseKeywordValue(propertyID, string))
         return keyword.release();
     if (RefPtrWillBeRawPtr<CSSValue> transform = parseSimpleTransform(propertyID, string))
         return transform.release();
     return nullptr;
 }
 
 } // namespace blink