ui: Cleanup class/struct forward declarations

third_party/WebKit/LayoutTests/fast/dnd/resources/event-mouse-coordinates.css

Index: third_party/WebKit/LayoutTests/fast/dnd/resources/event-mouse-coordinates.css
diff --git a/third_party/WebKit/LayoutTests/fast/dnd/resources/event-mouse-coordinates.css b/third_party/WebKit/LayoutTests/fast/dnd/resources/event-mouse-coordinates.css
new file mode 100644
index 0000000000000000000000000000000000000000..f4923646f61ba677de8dbaf9ed260b6196f7e40a
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/fast/dnd/resources/event-mouse-coordinates.css
@@ -0,0 +1,23 @@
+html, body {
+  margin: 0;
+  padding: 0;
+  display: block;
+}
+.box {
+  display: block;
+  border: 1px solid black;
+  width: 100px;
+  height: 100px;
+}
+.dragged {
+  position: absolute;
+  left: 199px;  /* Get the box's client area at 200,100. */
+  top: 99px;
+  cursor: pointer;
+}
+.dropzone {
+  position: absolute;
+  left: 399px; /* Get the box's client area at 400,300. */
+  top: 299px;
+  border-style: dashed;
+}