Centralize TextStream functions to remove RenderTreeAsText dependency of the filters

Source/core/rendering/RenderTreeAsText.h

Index: Source/core/rendering/RenderTreeAsText.h
diff --git a/Source/core/rendering/RenderTreeAsText.h b/Source/core/rendering/RenderTreeAsText.h
index ddf534d66e1a215600ff73323fe1b9829a592039..cf8b38653f15ead85415bfa2a7bd4f9d4c631f6e 100644
--- a/Source/core/rendering/RenderTreeAsText.h
+++ b/Source/core/rendering/RenderTreeAsText.h
@@ -32,12 +32,7 @@
 namespace WebCore {
 
 class Element;
-class FloatPoint;
-class FloatSize;
 class Frame;
-class IntPoint;
-class IntRect;
-class LayoutPoint;
 class RenderObject;
 class TextStream;
 
@@ -58,7 +53,6 @@ typedef unsigned RenderAsTextBehavior;
 String externalRepresentation(Frame*, RenderAsTextBehavior = RenderAsTextBehaviorNormal);
 String externalRepresentation(Element*, RenderAsTextBehavior = RenderAsTextBehaviorNormal);
 void write(TextStream&, const RenderObject&, int indent = 0, RenderAsTextBehavior = RenderAsTextBehaviorNormal);
-void writeIndent(TextStream&, int indent);
 
 class RenderTreeAsText {
 // FIXME: This is a cheesy hack to allow easy access to RenderStyle colors.  It won't be needed if we convert
@@ -68,28 +62,6 @@ public:
 static void writeRenderObject(TextStream& ts, const RenderObject& o, RenderAsTextBehavior behavior);
 };
 
-TextStream& operator<<(TextStream&, const IntPoint&);
-TextStream& operator<<(TextStream&, const IntRect&);
-TextStream& operator<<(TextStream&, const LayoutPoint&);
-TextStream& operator<<(TextStream&, const FloatPoint&);
-TextStream& operator<<(TextStream&, const FloatSize&);
-
-template<typename Item>
-TextStream& operator<<(TextStream& ts, const Vector<Item>& vector)
-{
-    ts << "[";
-
-    unsigned size = vector.size();
-    for (unsigned i = 0; i < size; ++i) {
-        ts << vector[i];
-        if (i < size - 1)
-            ts << ", ";
-    }
-
-    ts << "]";
-    return ts;
-}
-
 // Helper function shared with SVGRenderTreeAsText
 String quoteAndEscapeNonPrintables(const String&);