Apply a few missing const qualifiers in net/

net/http/http_auth_gssapi_posix.cc

Index: net/http/http_auth_gssapi_posix.cc
diff --git a/net/http/http_auth_gssapi_posix.cc b/net/http/http_auth_gssapi_posix.cc
index 7121406106fe4e460bb5f7c663d52e0944fc21cb..f79d1c885ea728a2f78cfb6fa3caf46707ac1f71 100644
--- a/net/http/http_auth_gssapi_posix.cc
+++ b/net/http/http_auth_gssapi_posix.cc
@@ -419,7 +419,7 @@ bool GSSAPISharedLibrary::InitImpl() {
 }
 
 base::NativeLibrary GSSAPISharedLibrary::LoadSharedLibrary() {
-  const char** library_names;
+  const char* const* library_names;
   size_t num_lib_names;
   const char* user_specified_library[1];
   if (!gssapi_library_name_.empty()) {
@@ -427,7 +427,7 @@ base::NativeLibrary GSSAPISharedLibrary::LoadSharedLibrary() {
     library_names = user_specified_library;
     num_lib_names = 1;
   } else {
-    static const char* kDefaultLibraryNames[] = {
+    static const char* const kDefaultLibraryNames[] = {
 #if defined(OS_MACOSX)
       "libgssapi_krb5.dylib"  // MIT Kerberos
 #elif defined(OS_OPENBSD)