Don't show a placeholder if the response contains the full image.

third_party/WebKit/Source/platform/network/HTTPParsers.cpp

Index: third_party/WebKit/Source/platform/network/HTTPParsers.cpp
diff --git a/third_party/WebKit/Source/platform/network/HTTPParsers.cpp b/third_party/WebKit/Source/platform/network/HTTPParsers.cpp
index 7ed28d653ef8fe7f23b5d6aadbd6f918c8f0befd..91b38a991c4799bf83713d2ed3c4382dd46b6c63 100644
--- a/third_party/WebKit/Source/platform/network/HTTPParsers.cpp
+++ b/third_party/WebKit/Source/platform/network/HTTPParsers.cpp
@@ -876,4 +876,13 @@ std::unique_ptr<JSONArray> parseJSONHeader(const String& header,
   return JSONArray::from(std::move(headerValue));
 }
 
+bool parseContentRangeHeaderFor206(const String& contentRange,
+                                   int64_t* firstBytePosition,
+                                   int64_t* lastBytePosition,
+                                   int64_t* instanceLength) {
+  return net::HttpUtil::ParseContentRangeHeaderFor206(
+      StringUTF8Adaptor(contentRange).asStringPiece(), firstBytePosition,
+      lastBytePosition, instanceLength);
+}
+
 }  // namespace blink