Avoid string construction overhead for lookup-only HpackEntry objects.

net/spdy/hpack/hpack_encoder_test.cc

Index: net/spdy/hpack/hpack_encoder_test.cc
diff --git a/net/spdy/hpack/hpack_encoder_test.cc b/net/spdy/hpack/hpack_encoder_test.cc
index e2c8feae7b29e229684d6d054729ca02a92806b3..cf30e4ee2afa4090c63362a3638ecc6b89f9c622 100644
--- a/net/spdy/hpack/hpack_encoder_test.cc
+++ b/net/spdy/hpack/hpack_encoder_test.cc
@@ -161,7 +161,7 @@ TEST_F(HpackEncoderTest, SingleDynamicIndex) {
   ExpectIndex(IndexOf(key_2_));
 
   SpdyHeaderBlock headers;
-  headers[key_2_->name()] = key_2_->value();
+  headers[key_2_->name().as_string()] = key_2_->value().as_string();
   CompareWithExpectedEncoding(headers);
 }
 
@@ -169,7 +169,7 @@ TEST_F(HpackEncoderTest, SingleStaticIndex) {
   ExpectIndex(IndexOf(static_));
 
   SpdyHeaderBlock headers;
-  headers[static_->name()] = static_->value();
+  headers[static_->name().as_string()] = static_->value().as_string();
   CompareWithExpectedEncoding(headers);
 }
 
@@ -178,7 +178,7 @@ TEST_F(HpackEncoderTest, SingleStaticIndexTooLarge) {
   ExpectIndex(IndexOf(static_));
 
   SpdyHeaderBlock headers;
-  headers[static_->name()] = static_->value();
+  headers[static_->name().as_string()] = static_->value().as_string();
   CompareWithExpectedEncoding(headers);
 
   EXPECT_EQ(0u, peer_.table_peer().dynamic_entries()->size());
@@ -188,7 +188,7 @@ TEST_F(HpackEncoderTest, SingleLiteralWithIndexName) {
   ExpectIndexedLiteral(key_2_, "value3");
 
   SpdyHeaderBlock headers;
-  headers[key_2_->name()] = "value3";
+  headers[key_2_->name().as_string()] = "value3";
   CompareWithExpectedEncoding(headers);
 
   // A new entry was inserted and added to the reference set.
@@ -230,7 +230,7 @@ TEST_F(HpackEncoderTest, EmitThanEvict) {
   ExpectIndexedLiteral("key3", "value3");
 
   SpdyHeaderBlock headers;
-  headers[key_1_->name()] = key_1_->value();
+  headers[key_1_->name().as_string()] = key_1_->value().as_string();
   headers["key3"] = "value3";
   CompareWithExpectedEncoding(headers);
 }