Use std::function instead of base::Callback in net/http2/.

net/http2/decoder/payload_decoders/priority_payload_decoder_test.cc

Index: net/http2/decoder/payload_decoders/priority_payload_decoder_test.cc
diff --git a/net/http2/decoder/payload_decoders/priority_payload_decoder_test.cc b/net/http2/decoder/payload_decoders/priority_payload_decoder_test.cc
index dabcba582c3a5f67ded260751dc3ca266e6b9197..d40b07c8dd35767c0d2a051b010f32bd7e77fd94 100644
--- a/net/http2/decoder/payload_decoders/priority_payload_decoder_test.cc
+++ b/net/http2/decoder/payload_decoders/priority_payload_decoder_test.cc
@@ -6,7 +6,6 @@
 
 #include <stddef.h>
 
-#include "base/bind.h"
 #include "base/logging.h"
 #include "net/http2/decoder/frame_parts.h"
 #include "net/http2/decoder/frame_parts_collector.h"
@@ -57,11 +56,6 @@ class PriorityPayloadDecoderTest
     : public AbstractPayloadDecoderTest<PriorityPayloadDecoder,
                                         PriorityPayloadDecoderPeer,
                                         Listener> {
- public:
-  static bool ApproveSizeForWrongSize(size_t size) {
-    return size != Http2PriorityFields::EncodedSize();
-  }
-
  protected:
   Http2PriorityFields RandPriorityFields() {
     Http2PriorityFields fields;
@@ -73,12 +67,13 @@ class PriorityPayloadDecoderTest
 // Confirm we get an error if the payload is not the correct size to hold
 // exactly one Http2PriorityFields.
 TEST_F(PriorityPayloadDecoderTest, WrongSize) {
+  auto approve_size = [](size_t size) {
+    return size != Http2PriorityFields::EncodedSize();
+  };
   Http2FrameBuilder fb;
   fb.Append(RandPriorityFields());
   fb.Append(RandPriorityFields());
-  EXPECT_TRUE(VerifyDetectsFrameSizeError(
-      0, fb.buffer(),
-      base::Bind(&PriorityPayloadDecoderTest::ApproveSizeForWrongSize)));
+  EXPECT_TRUE(VerifyDetectsFrameSizeError(0, fb.buffer(), approve_size));
 }
 
 TEST_F(PriorityPayloadDecoderTest, VariousPayloads) {