Moves HpackEntry index computation into the container class HpackHeaderTable.

net/spdy/hpack_decoder_test.cc

Index: net/spdy/hpack_decoder_test.cc
diff --git a/net/spdy/hpack_decoder_test.cc b/net/spdy/hpack_decoder_test.cc
index ffba52e0d96affbd8a80277fb04a229e2953352e..e51ea8ddb615fdafabf6785e8eca6c6e9eea10bd 100644
--- a/net/spdy/hpack_decoder_test.cc
+++ b/net/spdy/hpack_decoder_test.cc
@@ -96,7 +96,7 @@ class HpackDecoderTest : public ::testing::Test {
     EXPECT_EQ(name, entry->name()) << "index " << index;
     EXPECT_EQ(value, entry->value());
     EXPECT_EQ(size, entry->Size());
-    EXPECT_EQ(index, entry->Index());
+    EXPECT_EQ(index, decoder_peer_.header_table()->IndexOf(entry));
   }
 
   void expectStaticEntry(size_t index) {