Remove dead code for system VK.

ui/keyboard/resources/images/back.svg

Index: ui/keyboard/resources/images/back.svg
diff --git a/ui/keyboard/resources/images/back.svg b/ui/keyboard/resources/images/back.svg
deleted file mode 100644
index 61895dc4ae124e3b15f679534a18193c299c1ba9..0000000000000000000000000000000000000000
--- a/ui/keyboard/resources/images/back.svg
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!-- Created with Inkscape (http://www.inkscape.org/) -->
-
-<svg
-   xmlns:dc="http://purl.org/dc/elements/1.1/"
-   xmlns:cc="http://creativecommons.org/ns#"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   version="1.1"
-   width="43.75"
-   height="26.25"
-   id="svg2"
-   xml:space="preserve"><metadata
-     id="metadata8"><rdf:RDF><cc:Work
-         rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
-           rdf:resource="http://purl.org/dc/dcmitype/StillImage" /></cc:Work></rdf:RDF></metadata><defs
-     id="defs6" /><g
-     transform="matrix(1.25,0,0,-1.25,0,26.25)"
-     id="g10"><g
-       transform="translate(22.2734,11.2998)"
-       id="g12"><path
-         d="m 0,0 -6.845,0 2.8,2.8 -1.132,1.132 -4.697,-4.699 4.688,-4.764 1.14,1.122 L -6.81,-1.6 0,-1.6 0,0 z"
-         inkscape:connector-curvature="0"
-         id="path14"
-         style="fill:#ffffff;fill-opacity:1;fill-rule:nonzero;stroke:none" /></g></g></svg>