Change DecodeAndValidateSeveralWays() argument to const ref.

This CL lands server changes 163065386 by clshepherd
and 164147233 by bnc.

BUG=488484

Change-Id: I2dd1d319e3221cc1ab356a04b6bf60374870fd83
Reviewed-on: https://chromium-review.googlesource.com/600732
Commit-Queue: Bence Béky <bnc@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491910}

net/http2/hpack/decoder/hpack_block_decoder_test.cc

@@ -4,6 +4,9 @@
 
 #include "net/http2/hpack/decoder/hpack_block_decoder.h"
 
+#include <cstdint>
+#include <strstream>
+
 // Tests of HpackBlockDecoder.
 
 #include <sstream>
@@ -53,14 +56,14 @@ class HpackBlockDecoderTest : public RandomDecoderTest {
   }
 
   AssertionResult DecodeAndValidateSeveralWays(DecodeBuffer* db,
-                                               Validator validator) {
+                                               const Validator& validator) {
     bool return_non_zero_on_first = false;
     return RandomDecoderTest::DecodeAndValidateSeveralWays(
         db, return_non_zero_on_first, validator);
   }
 
   AssertionResult DecodeAndValidateSeveralWays(const HpackBlockBuilder& hbb,
-                                               Validator validator) {
+                                               const Validator& validator) {
     DecodeBuffer db(hbb.buffer());
     return DecodeAndValidateSeveralWays(&db, validator);
   }

net/http2/hpack/decoder/hpack_entry_decoder_test.cc

@@ -4,6 +4,8 @@
 
 #include "net/http2/hpack/decoder/hpack_entry_decoder.h"
 
+#include <cstdint>
+
 // Tests of HpackEntryDecoder.
 
 #include "net/http2/hpack/decoder/hpack_entry_collector.h"
@@ -34,7 +36,7 @@ class HpackEntryDecoderTest : public RandomDecoderTest {
   }
 
   AssertionResult DecodeAndValidateSeveralWays(DecodeBuffer* db,
-                                               Validator validator) {
+                                               const Validator& validator) {
     // StartDecoding, above, requires the DecodeBuffer be non-empty so that it
     // can call Start with the prefix byte.
     bool return_non_zero_on_first = true;
@@ -43,7 +45,7 @@ class HpackEntryDecoderTest : public RandomDecoderTest {
   }
 
   AssertionResult DecodeAndValidateSeveralWays(const HpackBlockBuilder& hbb,
-                                               Validator validator) {
+                                               const Validator& validator) {
     DecodeBuffer db(hbb.buffer());
     return DecodeAndValidateSeveralWays(&db, validator);
   }