fetch: Drop Headers from HeadersInit typedef declaration.

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

Index: third_party/WebKit/Source/modules/fetch/Headers.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/Headers.cpp b/third_party/WebKit/Source/modules/fetch/Headers.cpp
index 85f7b18d77b9d1b5296046d2e2572744d961f562..7e6ea5f597759d5747cbd4997c10bab85c27a85b 100644
--- a/third_party/WebKit/Source/modules/fetch/Headers.cpp
+++ b/third_party/WebKit/Source/modules/fetch/Headers.cpp
@@ -6,7 +6,7 @@
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8IteratorResultValue.h"
-#include "bindings/modules/v8/ByteStringSequenceSequenceOrByteStringByteStringRecordOrHeaders.h"
+#include "bindings/modules/v8/ByteStringSequenceSequenceOrByteStringByteStringRecord.h"
 #include "core/dom/Iterator.h"
 #include "platform/loader/fetch/FetchUtils.h"
 #include "platform/wtf/text/WTFString.h"
@@ -206,11 +206,11 @@ void Headers::set(const String& name,
   header_list_->Set(name, value);
 }
 
+// This overload is not called directly by Web APIs, but rather by other C++
+// classes. For example, when initializing a Request object it is possible that
+// a Request's Headers must be filled with an existing Headers object.
 void Headers::FillWith(const Headers* object, ExceptionState& exception_state) {
   DCHECK(header_list_->size() == 0);
-  // There used to be specific steps describing filling a Headers object with
-  // another Headers object, but it has since been removed because it should be
-  // handled like a sequence (http://crbug.com/690428).
   for (const auto& header : object->header_list_->List()) {
     append(header.first, header.second, exception_state);
     if (exception_state.HadException())
@@ -225,9 +225,6 @@ void Headers::FillWith(const HeadersInit& init,
     FillWith(init.getAsByteStringSequenceSequence(), exception_state);
   } else if (init.isByteStringByteStringRecord()) {
     FillWith(init.getAsByteStringByteStringRecord(), exception_state);
-  } else if (init.isHeaders()) {
-    // This branch will not be necessary once http://crbug.com/690428 is fixed.
-    FillWith(init.getAsHeaders(), exception_state);
   } else {
     NOTREACHED();
   }