Delete unused code.

src/geo/stream-radians.js

@@ -1,5 +0,0 @@
-function d3_geo_streamRadians(stream) {
-  return d3_geo_streamTransform(stream, function(x, y) {
-    stream.point(x * d3_radians, y * d3_radians);
-  });
-}

src/geo/stream-rotate.js

@@ -1,6 +0,0 @@
-function d3_geo_streamRotate(rotate, stream) {
-  return d3_geo_streamTransform(stream, function(x, y) {
-    x = rotate(x, y);
-    stream.point(x[0], x[1]);
-  });
-}

src/geo/stream-transform.js

@@ -1,10 +0,0 @@
-function d3_geo_streamTransform(stream, point) {
-  return {
-    point: point,
-    sphere: stream.sphere,
-    lineStart: stream.lineStart,
-    lineEnd: stream.lineEnd,
-    polygonStart: stream.polygonStart,
-    polygonEnd: stream.polygonEnd
-  };
-}