Add some break statements in spdy_protocol for clarity.

net/spdy/spdy_protocol.cc

Index: net/spdy/spdy_protocol.cc
diff --git a/net/spdy/spdy_protocol.cc b/net/spdy/spdy_protocol.cc
index 157993caff8afc21e91ef5abfab360ac7cce6241..cec9ba29dc06da07abf0e0ab09fe3bcfcdef83b6 100644
--- a/net/spdy/spdy_protocol.cc
+++ b/net/spdy/spdy_protocol.cc
@@ -86,6 +86,7 @@ SpdyFrameType SpdyConstants::ParseFrameType(SpdyMajorVersion version,
         case 9:
           return WINDOW_UPDATE;
       }
+      break;
     case SPDY4:
       switch (frame_type_field) {
         case 0:
@@ -110,6 +111,7 @@ SpdyFrameType SpdyConstants::ParseFrameType(SpdyMajorVersion version,
         case 10:
           return BLOCKED;
       }
+      break;
   }
 
   LOG(DFATAL) << "Unhandled frame type " << frame_type_field;