Rename default -> initial style and use singletons.

Source/core/css/CSSMatrix.cpp

Index: Source/core/css/CSSMatrix.cpp
diff --git a/Source/core/css/CSSMatrix.cpp b/Source/core/css/CSSMatrix.cpp
index 6b95d00bbfb671b6b7c7e231176561dce0c0e7fb..c11b392b64e1d86f95e1de7cb1371e77963a7d9b 100644
--- a/Source/core/css/CSSMatrix.cpp
+++ b/Source/core/css/CSSMatrix.cpp
@@ -69,9 +69,9 @@ void CSSMatrix::setMatrixValue(const String& string, ExceptionState& exceptionSt
             return;
 
         // FIXME: This has a null pointer crash if we use ex units (crbug.com/414145)
-        DEFINE_STATIC_REF(LayoutStyle, defaultStyle, LayoutStyle::createDefaultStyle());
+        DEFINE_STATIC_REF(LayoutStyle, initialStyle, LayoutStyle::create());
         TransformOperations operations;
-        if (!TransformBuilder::createTransformOperations(value.get(), CSSToLengthConversionData(defaultStyle, defaultStyle, nullptr, 1.0f), operations)) {
+        if (!TransformBuilder::createTransformOperations(value.get(), CSSToLengthConversionData(initialStyle, initialStyle, nullptr, 1.0f), operations)) {
             exceptionState.throwDOMException(SyntaxError, "Failed to interpret '" + string + "' as a transformation operation.");
             return;
         }