Switch tracing to new flexbox.

tracing/tracing/ui/extras/chrome/cc/display_item_debugger.html

Index: tracing/tracing/ui/extras/chrome/cc/display_item_debugger.html
diff --git a/tracing/tracing/ui/extras/chrome/cc/display_item_debugger.html b/tracing/tracing/ui/extras/chrome/cc/display_item_debugger.html
index 16ecd094c1a09710b5c63f6b5cc33da4c484fa41..ba428cadaa0547d2fee79027f5bd77137d785cdf 100644
--- a/tracing/tracing/ui/extras/chrome/cc/display_item_debugger.html
+++ b/tracing/tracing/ui/extras/chrome/cc/display_item_debugger.html
@@ -21,20 +21,20 @@ found in the LICENSE file.
 <template id="tr-ui-e-chrome-cc-display-item-debugger-template">
   <style>
   * /deep/ tr-ui-e-chrome-cc-display-item-debugger {
-    -webkit-flex: 1 1 auto;
-    display: -webkit-flex;
+    flex: 1 1 auto;
+    display: flex;
   }
 
   * /deep/ tr-ui-e-chrome-cc-display-item-debugger > left-panel {
-    -webkit-flex-direction: column;
-    display: -webkit-flex;
+    flex-direction: column;
+    display: flex;
     min-width: 300px;
     overflow-y: auto;
   }
 
   * /deep/ tr-ui-e-chrome-cc-display-item-debugger > left-panel >
         display-item-info {
-    -webkit-flex: 1 1 auto;
+    flex: 1 1 auto;
     padding-top: 2px;
   }
 
@@ -51,12 +51,12 @@ found in the LICENSE file.
   }
 
   * /deep/ tr-ui-e-chrome-cc-display-item-debugger > tr-ui-b-drag-handle {
-    -webkit-flex: 0 0 auto;
+    flex: 0 0 auto;
   }
 
   * /deep/ tr-ui-e-chrome-cc-display-item-debugger > right-panel {
-    -webkit-flex: 1 1 auto;
-    display: -webkit-flex;
+    flex: 1 1 auto;
+    display: flex;
   }
 
   * /deep/ tr-ui-e-chrome-cc-display-item-debugger > left-panel >
@@ -88,7 +88,7 @@ found in the LICENSE file.
   }
 
   * /deep/ tr-ui-e-chrome-cc-display-item-debugger raster-area {
-    -webkit-flex: 1 1 auto;
+    flex: 1 1 auto;
     background-color: #ddd;
     min-height: 200px;
     min-width: 200px;