When was SkPDiff last used?

tools/skpdiff/viewer_style.css

Index: tools/skpdiff/viewer_style.css
diff --git a/tools/skpdiff/viewer_style.css b/tools/skpdiff/viewer_style.css
deleted file mode 100644
index 1e4420fe850ca8dfc1622a1d9f8d136ec0663767..0000000000000000000000000000000000000000
--- a/tools/skpdiff/viewer_style.css
+++ /dev/null
@@ -1,173 +0,0 @@
-body, img, div {
-    font-family: Verdana;
-    margin: 0;
-    padding: 0;
-}
-
-table {
-    width: auto;
-    border-collapse: collapse;
-    border-spacing: 0;
-    padding: 8px;
-}
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-td {
-    border-top: 1px solid #DDD;
-    padding: 16px;
-}
-thead > tr > td {
-    border: none;
-}
-
-button {
-    font-family: Verdana;
-    font-weight: 900;
-}
-
-input[type="checkbox"] {
-    -webkit-appearance: none;
-    -moz-appearance: none;
-    width: 20px;
-    height:20px;
-    padding: 2px;
-    background: #EEE;
-    border-radius: 2px;
-    box-shadow: inset 0 0 8px -2px black;
-}
-
-input[type="checkbox"]:checked {
-    background: #a9db80;
-    background:  -webkit-linear-gradient(top, #00b7ea 0%,#009ec3 100%);
-}
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-input[type="checkbox"]:active {
-    background: #a9db80;
-    background: -webkit-linear-gradient(top, #009ec3 0%,#00b7ea 100%);
-}
-
-input[type="checkbox"].lastselected {
-    padding: 0;
-    border: 2px solid #009ec3;
-    box-shadow: inset 0 0 8px -2px black, 0 0 6px black;
-}
-
-.commit {
-    position: absolute;
-    top: 8px;
-    right: 8px;
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-.commit > button {
-    border: 1px solid #00687F;
-    border-radius: 4px;
-    padding: 8px;
-    color: white;
-    text-shadow: 0 0 4px black;
-    box-shadow: 0 0 8px black;
-    background: #a9db80;
-    background: -webkit-linear-gradient(top, #a9db80 0%,#96c56f 100%);
-}
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-.commit > button:active {
-    background: #96c56f;
-    background: -webkit-linear-gradient(top, #96c56f 0%,#a9db80 100%);
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-.common-name {
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-.gm-image {
-    border: 1px dotted black;
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-.gm-image:hover {
-    border: 1px dashed black;
-}
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-.selected {
-    background: #ffff88;
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-.left-image {
-    float: right;
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-.right-image {
-    text-align: right;
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-.success-flash {
-    -webkit-animation-duration: 0.5s;
-    -webkit-animation-name: greenflash;
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-.failure-flash {
-    -webkit-animation-duration: 0.8s;
-    -webkit-animation-name: redflash;
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-    from {
-        background-color: #8F8;
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-    to {
-        background-color: #FFF
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-@-webkit-keyframes redflash {
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-        background-color: #F88;
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-.result {
-    padding: 8px;
-    cursor: default;
-    -webkit-filter: grayscale(30%)
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-    border: 2px dotted #DDD;
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-.result-6 {
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-.result-7 {
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