Remove explicit keyword from multi-arg SpdyPriorityIR constructor.

net/spdy/spdy_protocol.h

Index: net/spdy/spdy_protocol.h
diff --git a/net/spdy/spdy_protocol.h b/net/spdy/spdy_protocol.h
index 1837feb2c87150e84980dcb5a8fe0417b5450e7d..f4d22228b29f49c962defdcc978d7252b949abe5 100644
--- a/net/spdy/spdy_protocol.h
+++ b/net/spdy/spdy_protocol.h
@@ -999,10 +999,10 @@ class NET_EXPORT_PRIVATE SpdyPriorityIR : public SpdyFrameWithStreamIdIR {
         parent_stream_id_(0),
         weight_(1),
         exclusive_(false) {}
-  explicit SpdyPriorityIR(SpdyStreamId stream_id,
-                          SpdyStreamId parent_stream_id,
-                          uint8 weight,
-                          bool exclusive)
+  SpdyPriorityIR(SpdyStreamId stream_id,
+                 SpdyStreamId parent_stream_id,
+                 uint8 weight,
+                 bool exclusive)
       : SpdyFrameWithStreamIdIR(stream_id),
         parent_stream_id_(parent_stream_id),
         weight_(weight),