[Fetch API] Add streams predicates to BodyStreamBuffer

third_party/WebKit/Source/modules/fetch/Body.cpp

Index: third_party/WebKit/Source/modules/fetch/Body.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/Body.cpp b/third_party/WebKit/Source/modules/fetch/Body.cpp
index 834bb69dce0c11ed946e38152fae200d0a5add45..670ea27b1e45ca179c84449e2b08beb0cad2f913 100644
--- a/third_party/WebKit/Source/modules/fetch/Body.cpp
+++ b/third_party/WebKit/Source/modules/fetch/Body.cpp
@@ -270,12 +270,12 @@ ScriptValue Body::v8ExtraStreamBody(ScriptState* scriptState)
 
 bool Body::bodyUsed()
 {
-    return body() && body()->isDisturbed();
+    return bodyBuffer() && bodyBuffer()->isStreamDisturbed();
 }
 
 bool Body::isBodyLocked()
 {
-    return body() && body()->isLocked();
+    return bodyBuffer() && bodyBuffer()->isStreamLocked();
 }
 
 bool Body::hasPendingActivity() const