Ship ImageBitmap and createImageBitmap

Now that we have 3 LGTMs for ImageBitmap and createImageBitmap to ship:
https://groups.google.com/a/chromium.org/d/topic/blink-dev/jRzvehX9U1U/discussion,
let's ship it and expose it to larger audience!

This CL removes the Runtime flag in ImageBitmapFactories.idl and updates
some global interface layout tests results.

BUG=249384

Review URL: https://codereview.chromium.org/1636633002

Cr-Commit-Position: refs/heads/master@{#371340}

third_party/WebKit/LayoutTests/virtual/stable/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt

@@ -609,6 +609,7 @@ interface WorkerGlobalScope : EventTarget
     method clearTimeout
     method close
     method constructor
+    method createImageBitmap
     method fetch
     method importScripts
     method setInterval

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-dedicated-worker-expected.txt

@@ -579,6 +579,7 @@ Starting worker: resources/global-interface-listing.js
 [Worker]     method clearTimeout
 [Worker]     method close
 [Worker]     method constructor
+[Worker]     method createImageBitmap
 [Worker]     method fetch
 [Worker]     method importScripts
 [Worker]     method setInterval

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt

@@ -5982,6 +5982,7 @@ interface webkitURL
     method clearTimeout
     method close
     method confirm
+    method createImageBitmap
     method fetch
     method find
     method focus

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-shared-worker-expected.txt

@@ -571,6 +571,7 @@ Starting worker: resources/global-interface-listing.js
 [Worker]     method clearTimeout
 [Worker]     method close
 [Worker]     method constructor
+[Worker]     method createImageBitmap
 [Worker]     method fetch
 [Worker]     method importScripts
 [Worker]     method setInterval

third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.idl

@@ -41,7 +41,6 @@ typedef (HTMLImageElement or
     LegacyTreatAsPartialInterface,
     NoInterfaceObject, // Always used on target of 'implements'
     Exposed=(Window,Worker),
-    RuntimeEnabled=ExperimentalCanvasFeatures,
 ] interface ImageBitmapFactories {
     [CallWith=ScriptState, RaisesException] Promise createImageBitmap(ImageBitmapSource imageBitmap);
     [CallWith=ScriptState, RaisesException, RuntimeEnabled=ExperimentalCanvasFeatures] Promise createImageBitmap(