Revert of Include class relationship diagrams in network stack documentation.

build/gn_migration.gypi

Index: build/gn_migration.gypi
diff --git a/build/gn_migration.gypi b/build/gn_migration.gypi
index 16fa4cf8f2b6ecd7b62895d7bfd207b5cb1b15b8..00fc23f0d7239cba256e2f98396410f02e901c4c 100644
--- a/build/gn_migration.gypi
+++ b/build/gn_migration.gypi
@@ -696,6 +696,7 @@
         ['OS=="linux" or OS=="win"', {
           'dependencies': [
             # TODO(GYP): Figure out which of these run on android/mac/win/ios/etc.
+            '../net/net.gyp:net_docs',
             '../remoting/remoting.gyp:ar_sample_test_driver',
 
             # TODO(GYP): in progress - see tfarina.
@@ -723,6 +724,7 @@
             '../content/content_shell_and_tests.gyp:content_shell_crash_service',
             '../gpu/gpu.gyp:angle_end2end_tests',
             '../gpu/gpu.gyp:angle_perftests',
+            '../net/net.gyp:net_docs',
             '../ppapi/ppapi_internal.gyp:ppapi_perftests',
             '../remoting/remoting.gyp:ar_sample_test_driver',
             '../remoting/remoting.gyp:remoting_breakpad_tester',