Add CompareSpdyHeaderBlocks() test helper method.

net/spdy/spdy_test_utils.cc

Index: net/spdy/spdy_test_utils.cc
diff --git a/net/spdy/spdy_test_utils.cc b/net/spdy/spdy_test_utils.cc
index 7f0d4e2a86b66a58298c394ed3dd51a82b0f80f4..eb721ef32c0348a90e1e173c6b52435488ed3f31 100644
--- a/net/spdy/spdy_test_utils.cc
+++ b/net/spdy/spdy_test_utils.cc
@@ -17,7 +17,6 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
-
 namespace test {
 
 std::string HexDumpWithMarks(const unsigned char* data, int length,
@@ -130,6 +129,11 @@ void SetFrameLength(SpdyFrame* frame,
   }
 }
 
+bool CompareSpdyHeaderBlocks(const SpdyHeaderBlock& a,
+                             const SpdyHeaderBlock& b) {
+  return a.size() == b.size() && std::equal(a.begin(), a.end(), b.begin());
+}
+
 std::string a2b_hex(const char* hex_data) {
   std::vector<uint8> output;
   std::string result;
@@ -169,5 +173,4 @@ void AddPin(TransportSecurityState* state,
 }
 
 }  // namespace test
-
 }  // namespace net