Revert r154797: "Move isValid/isCurrentColor from Color to StyleColor"

Source/core/rendering/svg/SVGInlineTextBox.cpp

Index: Source/core/rendering/svg/SVGInlineTextBox.cpp
diff --git a/Source/core/rendering/svg/SVGInlineTextBox.cpp b/Source/core/rendering/svg/SVGInlineTextBox.cpp
index 882ddcda3acbf3d9670b271cd975bf65f705ade6..d15a979b6a4be3b75daa4354f9be95c54d4b3b49 100644
--- a/Source/core/rendering/svg/SVGInlineTextBox.cpp
+++ b/Source/core/rendering/svg/SVGInlineTextBox.cpp
@@ -206,7 +206,7 @@ void SVGInlineTextBox::paintSelectionBackground(PaintInfo& paintInfo)
         return;
 
     Color backgroundColor = renderer()->selectionBackgroundColor();
-    if (!backgroundColor.alpha())
+    if (!backgroundColor.isValid() || !backgroundColor.alpha())
         return;
 
     RenderSVGInlineText* textRenderer = toRenderSVGInlineText(this->textRenderer());
@@ -368,7 +368,7 @@ bool SVGInlineTextBox::acquirePaintingResource(GraphicsContext*& context, float
     ASSERT(style);
     ASSERT(m_paintingResourceMode != ApplyToDefaultMode);
 
-    StyleColor fallbackColor;
+    Color fallbackColor;
     if (m_paintingResourceMode & ApplyToFillMode)
         m_paintingResource = RenderSVGResource::fillPaintingResource(renderer, style, fallbackColor);
     else if (m_paintingResourceMode & ApplyToStrokeMode)
@@ -384,7 +384,7 @@ bool SVGInlineTextBox::acquirePaintingResource(GraphicsContext*& context, float
     if (!m_paintingResource->applyResource(renderer, style, context, m_paintingResourceMode)) {
         if (fallbackColor.isValid()) {
             RenderSVGResourceSolidColor* fallbackResource = RenderSVGResource::sharedSolidPaintingResource();
-            fallbackResource->setColor(fallbackColor.color());
+            fallbackResource->setColor(fallbackColor);
 
             m_paintingResource = fallbackResource;
             m_paintingResource->applyResource(renderer, style, context, m_paintingResourceMode);
@@ -641,7 +641,7 @@ void SVGInlineTextBox::paintTextWithShadows(GraphicsContext* context, RenderStyl
         DrawLooper drawLooper;
         do {
             FloatSize offset(shadow->x(), shadow->y());
-            drawLooper.addShadow(offset, shadow->blur(), textRenderer->resolveColor(shadow->color(), Color::stdShadowColor),
+            drawLooper.addShadow(offset, shadow->blur(), shadow->color(),
                 DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowRespectsAlpha);
         } while ((shadow = shadow->next()));
         drawLooper.addUnmodifiedContent();