Remove dead code for system VK.

ui/keyboard/resources/images/volume-down.svg

Index: ui/keyboard/resources/images/volume-down.svg
diff --git a/ui/keyboard/resources/images/volume-down.svg b/ui/keyboard/resources/images/volume-down.svg
deleted file mode 100644
index 17802493bb571d8e70e98b7fd1255973c4d52d1d..0000000000000000000000000000000000000000
--- a/ui/keyboard/resources/images/volume-down.svg
+++ /dev/null
@@ -1,46 +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"><clipPath
-       id="clipPath16"><path
-         d="M 0,21 35,21 35,0 0,0 0,21 z"
-         inkscape:connector-curvature="0"
-         id="path18" /></clipPath></defs><g
-     transform="matrix(1.25,0,0,-1.25,0,26.25)"
-     id="g10"><g
-       id="g12"><g
-         clip-path="url(#clipPath16)"
-         id="g14"><g
-           transform="translate(15.0176,11.0693)"
-           id="g20"><path
-             d="m 0,0 c 0,0.002 4.796,-4.8 4.796,-4.8 l 0,9.6 L 0,0 z"
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-             id="path22"
-             style="fill:#ffffff;fill-opacity:1;fill-rule:nonzero;stroke:none" /></g><g
-           transform="translate(20.9336,13.5557)"
-           id="g24"><path
-             d="M 0,0 0,-1.169 C 0.512,-1.387 0.872,-1.896 0.872,-2.486 0.872,-3.077 0.512,-3.585 0,-3.804 l 0,-1.169 c 1.14,0.257 1.992,1.27 1.992,2.487 C 1.992,-1.27 1.14,-0.256 0,0"
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