Splitting fpdfdoc/doc_* part III.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 4b6e6581a8fa46f2975f43150dd12acda7c6c540..f0adbc988ae1cc4d3fc25094c0d4f89f464cde77 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -209,16 +209,24 @@ static_library("fpdfdoc") {
     "core/fpdfdoc/cpdf_actionfields.cpp",
     "core/fpdfdoc/cpdf_annot.cpp",
     "core/fpdfdoc/cpdf_annotlist.cpp",
+    "core/fpdfdoc/cpdf_apsettings.cpp",
     "core/fpdfdoc/cpdf_apsettings.h",
     "core/fpdfdoc/cpdf_bookmark.cpp",
     "core/fpdfdoc/cpdf_bookmarktree.cpp",
+    "core/fpdfdoc/cpdf_defaultappearance.cpp",
     "core/fpdfdoc/cpdf_dest.cpp",
     "core/fpdfdoc/cpdf_docjsactions.cpp",
     "core/fpdfdoc/cpdf_filespec.cpp",
+    "core/fpdfdoc/cpdf_formcontrol.cpp",
+    "core/fpdfdoc/cpdf_formfield.cpp",
+    "core/fpdfdoc/cpdf_iconfit.cpp",
+    "core/fpdfdoc/cpdf_interform.cpp",
     "core/fpdfdoc/cpdf_link.cpp",
     "core/fpdfdoc/cpdf_linklist.cpp",
     "core/fpdfdoc/cpdf_metadata.cpp",
     "core/fpdfdoc/cpdf_nametree.cpp",
+    "core/fpdfdoc/cpdf_numbertree.cpp",
+    "core/fpdfdoc/cpdf_numbertree.h",
     "core/fpdfdoc/cpdf_occontext.cpp",
     "core/fpdfdoc/cpdf_pagelabel.cpp",
     "core/fpdfdoc/cpdf_pagelabel.h",
@@ -242,11 +250,6 @@ static_library("fpdfdoc") {
     "core/fpdfdoc/csection.h",
     "core/fpdfdoc/ctypeset.cpp",
     "core/fpdfdoc/ctypeset.h",
-    "core/fpdfdoc/doc_form.cpp",
-    "core/fpdfdoc/doc_formcontrol.cpp",
-    "core/fpdfdoc/doc_formfield.cpp",
-    "core/fpdfdoc/doc_utils.cpp",
-    "core/fpdfdoc/doc_utils.h",
     "core/fpdfdoc/include/cpdf_aaction.h",
     "core/fpdfdoc/include/cpdf_action.h",
     "core/fpdfdoc/include/cpdf_actionfields.h",