The location of the chrome distillation source changed.

After https://codereview.chromium.org/987793002 the place where
the distillation script is copied has changed.

BUG=
R=nyquist@chromium.org

Review URL: https://codereview.chromium.org/1052613002

Patch from alex <alex@igalia.com�[39m>.

README.md

@@ -189,8 +189,8 @@ bash-function to help with that:
 roll-distiller () {
   (
     (cd $DOM_DISTILLER_DIR && ant package) && \
-    rm -rf $CHROME_SRC/third_party/dom_distiller_js/package/* && \
-    cp -rf $DOM_DISTILLER_DIR/out/package/* $CHROME_SRC/third_party/dom_distiller_js/package && \
+    rm -rf $CHROME_SRC/third_party/dom_distiller_js/dist/* && \
+    cp -rf $DOM_DISTILLER_DIR/out/package/* $CHROME_SRC/third_party/dom_distiller_js/dist/ && \
     touch $CHROME_SRC/components/resources/dom_distiller_resources.grdp
   )
 }