Splitting fpdfdoc/doc_* part III.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 30a59336cb494c94b109b5a401eee976ee7c3ffc..b76456b5e061b749e0d0d4d1ae6c75044f01ceab 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -205,16 +205,24 @@ 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",
@@ -238,11 +246,6 @@ 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",