Remove runtime flag for readable byte streams

They are now enabled by default.

BUG=614302

Change-Id: Ied5e70e3bd6405e296d9b6fa0fccec5beb9ce1aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643419
Auto-Submit: Adam Rice <ricea@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845959}

third_party/blink/renderer/core/streams/readable_byte_stream_controller.idl

@@ -4,8 +4,7 @@
 
 // https://streams.spec.whatwg.org/#rbs-controller-class-definition
 [
-    Exposed=(Window,Worker,Worklet),
-    RuntimeEnabled=ReadableByteStream
+    Exposed=(Window,Worker,Worklet)
 ] interface ReadableByteStreamController {
     readonly attribute ReadableStreamBYOBRequest? byobRequest;
     readonly attribute double? desiredSize;

third_party/blink/renderer/core/streams/readable_stream.cc

@@ -43,7 +43,6 @@
 #include "third_party/blink/renderer/platform/heap/persistent.h"
 #include "third_party/blink/renderer/platform/heap/visitor.h"
 #include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
-#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
 #include "third_party/blink/renderer/platform/wtf/assertions.h"
 #include "third_party/blink/renderer/platform/wtf/deque.h"
 
@@ -1416,11 +1415,6 @@ void ReadableStream::InitInternal(ScriptState* script_state,
 
     // 6. If typeString is "bytes",
     if (type_string == V8AtomicString(isolate, "bytes")) {
-      if (!RuntimeEnabledFeatures::ReadableByteStreamEnabled()) {
-        exception_state.ThrowRangeError("bytes type is not yet implemented");
-        return;
-      }
-
       UseCounter::Count(ExecutionContext::From(script_state),
                         WebFeature::kReadableStreamWithByteSource);
 

third_party/blink/renderer/core/streams/readable_stream_byob_reader.idl

@@ -4,8 +4,7 @@
 
 // https://streams.spec.whatwg.org/#byob-reader-class-definition
 [
-    Exposed=(Window,Worker,Worklet),
-    RuntimeEnabled=ReadableByteStream
+    Exposed=(Window,Worker,Worklet)
 ] interface ReadableStreamBYOBReader {
     [CallWith=ScriptState, RaisesException] constructor(ReadableStream stream);
 

third_party/blink/renderer/core/streams/readable_stream_byob_request.idl

@@ -4,8 +4,7 @@
 
 // https://streams.spec.whatwg.org/#readablestreambyobrequest
 [
-    Exposed=(Window,Worker,Worklet),
-    RuntimeEnabled=ReadableByteStream
+    Exposed=(Window,Worker,Worklet)
 ] interface ReadableStreamBYOBRequest {
     [RaisesException] readonly attribute ArrayBufferView? view;
 

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -1660,10 +1660,6 @@
       // Enabled when blink::features::kRawClipboard is enabled.
       name: "RawClipboard",
     },
-    {
-      name: "ReadableByteStream",
-      status: "stable",
-    },
     {
       name: "RemotePlayback",
       status: "stable",