Treat HTTP2 priority weight as zero-indexed.

net/spdy/spdy_framer_test.cc

Index: net/spdy/spdy_framer_test.cc
diff --git a/net/spdy/spdy_framer_test.cc b/net/spdy/spdy_framer_test.cc
index 9558a25cc93e4ac7ff8a8f2832988463d69de56d..6c17c6d4c79e8e2f05380cb4ecf8fc624ed2aacb 100644
--- a/net/spdy/spdy_framer_test.cc
+++ b/net/spdy/spdy_framer_test.cc
@@ -5329,11 +5329,11 @@ TEST_P(SpdyFramerTest, ReadPriority) {
     return;
   }
   SpdyFramer framer(spdy_version_);
-  SpdyPriorityIR priority(3, 1, 99, false);
+  SpdyPriorityIR priority(3, 1, 255, false);
   scoped_ptr<SpdySerializedFrame> frame(framer.SerializePriority(priority));
   testing::StrictMock<test::MockSpdyFramerVisitor> visitor;
   framer.set_visitor(&visitor);
-  EXPECT_CALL(visitor, OnPriority(3, 1, 99, false));
+  EXPECT_CALL(visitor, OnPriority(3, 1, 255, false));
   framer.ProcessInput(frame->data(), frame->size());
 
   EXPECT_EQ(SpdyFramer::SPDY_RESET, framer.state());