[Mojo Blob URLs] Change from RuntimeEnabledFeature to base::Feature.

This will make it possible to check if the feature is enabled from
outside blink, and will also make it easier to turn the feature back off
if necesary after trying to launch it.

Cq-Include-Trybots: luci.chromium.try:linux_mojo
Bug: 800901
Change-Id: I4cba8299c9f43727b5d52cb5c329d0da296e2b59
Reviewed-on: https://chromium-review.googlesource.com/1110846
Commit-Queue: Marijn Kruisselbrink <[email protected]>
Reviewed-by: Kinuko Yasuda <[email protected]>
Reviewed-by: Jeremy Roman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#569813}
diff --git a/third_party/WebKit/LayoutTests/VirtualTestSuites b/third_party/WebKit/LayoutTests/VirtualTestSuites
index 48ab208..df069367 100644
--- a/third_party/WebKit/LayoutTests/VirtualTestSuites
+++ b/third_party/WebKit/LayoutTests/VirtualTestSuites
@@ -709,6 +709,6 @@
   {
     "prefix": "mojo-blob-urls",
     "base": "external/wpt/FileAPI/url",
-    "args": ["--enable-blink-features=MojoBlobURLs"]
+    "args": ["--enable-features=MojoBlobURLs"]
   }
 ]