Change HpackHuffmanDecoder::CanonicalToSource() return type.

net/spdy/core/hpack/hpack_huffman_decoder_test.cc

Index: net/spdy/core/hpack/hpack_huffman_decoder_test.cc
diff --git a/net/spdy/core/hpack/hpack_huffman_decoder_test.cc b/net/spdy/core/hpack/hpack_huffman_decoder_test.cc
index ddf1bcd1cd22d29e832f95695c071e78eaec4e5a..8ab010f06b9077eb8c2f2199749fcf23b0698a4e 100644
--- a/net/spdy/core/hpack/hpack_huffman_decoder_test.cc
+++ b/net/spdy/core/hpack/hpack_huffman_decoder_test.cc
@@ -47,7 +47,7 @@ class HpackHuffmanDecoderPeer {
     return HpackHuffmanDecoder::DecodeToCanonical(code_length, bits);
   }
 
-  static char CanonicalToSource(HuffmanWord canonical) {
+  static uint8_t CanonicalToSource(HuffmanWord canonical) {
     return HpackHuffmanDecoder::CanonicalToSource(canonical);
   }
 };
@@ -68,8 +68,7 @@ class HpackHuffmanDecoderTest : public ::testing::Test {
     if (canonical == 256u) {
       return canonical;
     }
-    return static_cast<unsigned char>(
-        HpackHuffmanDecoderPeer::CanonicalToSource(canonical));
+    return HpackHuffmanDecoderPeer::CanonicalToSource(canonical);
   }
 
   void EncodeString(SpdyStringPiece input, SpdyString* encoded) {