Fix miter clipping of borders with large radius opposite a wide edge

third_party/WebKit/LayoutTests/fast/borders/border-large-radius-opposite-wide-edge.html

+<style>
+  div > div {
+    display: inline-block;
+    width: 150px;
+    height: 150px;
+  }
+  #topWide {
+    border: 5px solid black;
+    border-radius: 0px 0px 50px 50px;
+    border-top: 50px solid red;
+  }
+  #rightWide {
+    border: 5px solid black;
+    border-radius: 50px 0px 0px 50px;
+    border-right: 50px solid red;
+  }
+  #bottomWide {
+    border: 5px solid black;
+    border-radius: 50px 50px 0px 0px;
+    border-bottom: 50px solid red;
+  }
+  #leftWide {
+    border: 5px solid black;
+    border-radius: 0px 50px 50px 0px;
+    border-left: 50px solid red;
+  }
+</style>
+<div>
+  <div id="topWide"></div>
+  <div id="bottomWide"></div>
+</div>
+<div>
+  <div id="rightWide"></div>
+  <div id="leftWide"></div>
+</div>