Increase the NQE cache size from 3 to 10

net/nqe/network_qualities_prefs_manager.cc

Index: net/nqe/network_qualities_prefs_manager.cc
diff --git a/net/nqe/network_qualities_prefs_manager.cc b/net/nqe/network_qualities_prefs_manager.cc
index e11abd8574cfa60a76d169ca4b919a64c125b750..82e22c47a4476ce8e18297b78237d454fd043d00 100644
--- a/net/nqe/network_qualities_prefs_manager.cc
+++ b/net/nqe/network_qualities_prefs_manager.cc
@@ -19,7 +19,14 @@ namespace net {
 namespace {
 
 // Maximum size of the prefs that hold the qualities of different networks.
-static const size_t kMaxCacheSize = 3u;
+// A single entry in the cache consists of three tuples:
+// (i)   SSID or MCCMNC of the network. SSID is at most 32 characters in length
+//       (but is typically shorter than that). MCCMNC is at most 6 characters
+//       long.
+// (ii)  Connection type of the network as reported by network
+//       change notifier (an enum).
+// (iii) Effective connection type of the network (an enum).
+static const size_t kMaxCacheSize = 10u;
 
 // Parses |value| into a map of NetworkIDs and CachedNetworkQualities,
 // and returns the map.