Remove //net from GN exec_script whitelist.

.gn

 # This file is used by the GN meta build system to find the root of the source
 # tree and to set startup options. For documentation on the values set in this
 # file, run "gn help dotfile" at the command line.
 
 import("//build/dotfile_settings.gni")
 
 # The location of the build configuration file.
 buildconfig = "//build/config/BUILDCONFIG.gn"
 
 # The secondary source root is a parallel directory tree where
@@ skipping 177 matching lines @@
   "//v8/*",
   "//win8/*",
 ]
 
 # These are the list of GN files that run exec_script. This whitelist exists
 # to force additional review for new uses of exec_script, which is strongly
 # discouraged.
 #
 # GYPI_TO_GN
 #
-# Most of these entries are for gypi_to_gn calls. We should not be adding new
-# calls to this script in the build (see //build/gypi_to_gn.py for detailed
-# advice). The only time you should be editing this list for gypi_to_gn
-# purposes is when moving an existing call to a different place.
+# Some of these entries are for legacy gypi_to_gn calls. We should not be
+# adding new calls to this script in the build (see //build/gypi_to_gn.py for
+# detailed advice). The only time you should be editing this list for
+# gypi_to_gn purposes is when moving an existing call to a different place.
 #
 # PLEASE READ
 #
 # You should almost never need to add new exec_script calls. exec_script is
 # slow, especially on Windows, and can cause confusing effects. Although
 # individually each call isn't slow or necessarily very confusing, at the scale
 # of our repo things get out of hand quickly. By strongly pushing back on all
 # additions, we keep the build fast and clean. If you think you need to add a
 # new call, please consider:
 #
@@ skipping 48 matching lines @@
       "//android_webview/BUILD.gn",
       "//build_overrides/build.gni",
       "//chromeos/BUILD.gn",
 
       # TODO(dgn): Layer violation but breaks the build otherwise, see
       # https://crbug.com/474506.
       "//clank/java/BUILD.gn",
       "//clank/native/BUILD.gn",
 
       "//jingle/BUILD.gn",
-      "//net/BUILD.gn",
       "//remoting/host/installer/linux/BUILD.gn",
       "//remoting/remoting_version.gni",
       "//remoting/host/installer/win/generate_clsids.gni",
 
       # TODO(dpranke): Get these from the appropriate repos instead.
       "//third_party/angle/BUILD.gn",
       "//third_party/angle/src/tests/BUILD.gn",
       "//third_party/angle/src/vulkan_support/BUILD.gn",
       "//third_party/catapult/tracing/BUILD.gn",
       "//third_party/google_input_tools/inputview.gni",
 
       # CLD2 should be removed soon, delete this when we do.
       "//third_party/cld_2/BUILD.gn",
       "//tools/grit/grit_rule.gni",
 
       # Not gypi-to-gn.
       "//google_apis/BUILD.gn",
       "//printing/BUILD.gn",
     ]