Use custom scrollbars for print preview on non-retina mac displays.

chrome/browser/resources/pdf/scrollbars-mac.css

Index: chrome/browser/resources/pdf/scrollbars-mac.css
diff --git a/chrome/browser/resources/pdf/scrollbars-mac.css b/chrome/browser/resources/pdf/scrollbars-mac.css
new file mode 100644
index 0000000000000000000000000000000000000000..ee41bd1d20671f39b232e742640571280f425f13
--- /dev/null
+++ b/chrome/browser/resources/pdf/scrollbars-mac.css
@@ -0,0 +1,29 @@
+/*
+ * Imitate mac scrollbars on non-retina displays to workaround crbug.com/466039.
+ */
+@media
+(-webkit-max-device-pixel-ratio: 1.1) {

[Sam McNally, 2015/03/26 02:31:54]

1.0

[raymes, 2015/03/26 04:30:34]

Done.

+
+::-webkit-scrollbar {
+  height: 14px;
+  width: 14px;
+}
+
+::-webkit-scrollbar-track,
+::-webkit-scrollbar-corner {
+  background-color: rgb(242,242,242);
+}
+
+::-webkit-scrollbar-thumb:vertical,
+::-webkit-scrollbar-thumb:horizontal {
+  -webkit-border-radius: 7px;
+  background-color: rgb(198,198,198);
+  border: 3px solid rgb(242,242,242);
+}
+
+::-webkit-scrollbar-thumb:vertical:hover,
+::-webkit-scrollbar-thumb:horizontal:hover {
+  background: rgb(126,126,126);

[Sam McNally, 2015/03/26 02:31:54]

background-color

[raymes, 2015/03/26 04:30:34]

Done.

+}
+
+}