Split ScriptStreamer and ScriptStreamerImpl, preparing for unit testing

third_party/WebKit/Source/core/dom/PendingScript.cpp

Index: third_party/WebKit/Source/core/dom/PendingScript.cpp
diff --git a/third_party/WebKit/Source/core/dom/PendingScript.cpp b/third_party/WebKit/Source/core/dom/PendingScript.cpp
index c3471192149d5137d2587196893412edf0d0d8b1..61ba8a1840ce3a94fcc9f0771347ec925f19fd0c 100644
--- a/third_party/WebKit/Source/core/dom/PendingScript.cpp
+++ b/third_party/WebKit/Source/core/dom/PendingScript.cpp
@@ -27,6 +27,7 @@
 
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/ScriptStreamerImpl.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "core/dom/ClassicScript.h"
 #include "core/dom/Document.h"
@@ -290,7 +291,7 @@ void PendingScript::StartStreamingIfPossible(
   if (!script_state)
     return;
 
-  ScriptStreamer::StartStreaming(
+  ScriptStreamerImpl::StartStreaming(
       this, streamer_type, document->GetFrame()->GetSettings(), script_state,
       TaskRunnerHelper::Get(TaskType::kNetworking, document));
 }