Chrome 17 / Edge 18 added WebP support (#28653)

Tidy up WebP data

Author: ddbeck

mediatypes/image/webp.json

@@ -11,19 +11,13 @@
             "https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification#main-content"
           ],
           "support": {
-            "chrome": [
-              {
-                "version_added": "23"
-              },
-              {
-                "version_added": "17",
-                "version_removed": "23",
-                "partial_implementation": true,
-                "notes": "Lossless compression and alpha transparency are not supported."
-              }
-            ],
+            "chrome": {
+              "version_added": "17"
+            },
             "chrome_android": "mirror",
-            "edge": "mirror",
+            "edge": {
+              "version_added": "18"
+            },
             "firefox": {
               "version_added": "65"
             },