Rename default -> initial style and use singletons.

Source/core/css/CSSCalculationValueTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 71 matching lines @@
 {
     for (size_t i = 0; i < CSSPrimitiveValue::LengthUnitTypeCount; ++i) {
         if (a.at(i) != b.at(i))
             return false;
     }
     return true;
 }
 
 TEST(CSSCalculationValue, AccumulatePixelsAndPercent)
 {
-    RefPtr<LayoutStyle> style = LayoutStyle::createDefaultStyle();
+    RefPtr<LayoutStyle> style = LayoutStyle::create();
     style->setEffectiveZoom(5);
     CSSToLengthConversionData conversionData(style.get(), style.get(), nullptr, style->effectiveZoom());
 
     testAccumulatePixelsAndPercent(conversionData,
         CSSCalcValue::createExpressionNode(CSSPrimitiveValue::create(10, CSSPrimitiveValue::CSS_PX), true),
         50, 0);
 
     testAccumulatePixelsAndPercent(conversionData,
         CSSCalcValue::createExpressionNode(
             CSSCalcValue::createExpressionNode(CSSPrimitiveValue::create(10, CSSPrimitiveValue::CSS_PX), true),
@@ skipping 86 matching lines @@
     expectation.at(CSSPrimitiveValue::UnitTypePercentage) = 10;
     EXPECT_TRUE(lengthArraysEqual(expectation, setLengthArray(actual, "calc(1in + 10% - 6px)")));
 
     expectation.at(CSSPrimitiveValue::UnitTypePixels) = 15;
     expectation.at(CSSPrimitiveValue::UnitTypeFontSize) = 20;
     expectation.at(CSSPrimitiveValue::UnitTypePercentage) = -40;
     EXPECT_TRUE(lengthArraysEqual(expectation, setLengthArray(actual, "calc((1 * 2) * (5px + 20em / 2) - 80% / (3 - 1) + 5px)")));
 }
 
 }