Clean up fpdf_page_parsers

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 48b85c16b81112789136b796421ff10fe0e24c8b..61a5f992ec0c119af5ccee26db297fae6ee9ac3d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -432,6 +432,7 @@ static_library("fpdfapi") {
     "core/fpdfapi/page/cpdf_contentmark.h",
     "core/fpdfapi/page/cpdf_contentmarkitem.cpp",
     "core/fpdfapi/page/cpdf_contentmarkitem.h",
+    "core/fpdfapi/page/cpdf_contentparser.cpp",
     "core/fpdfapi/page/cpdf_countedobject.h",
     "core/fpdfapi/page/cpdf_docpagedata.cpp",
     "core/fpdfapi/page/cpdf_docpagedata.h",
@@ -471,6 +472,7 @@ static_library("fpdfapi") {
     "core/fpdfapi/page/cpdf_shadingpattern.h",
     "core/fpdfapi/page/cpdf_streamcontentparser.cpp",
     "core/fpdfapi/page/cpdf_streamcontentparser.h",
+    "core/fpdfapi/page/cpdf_streamparser.cpp",
     "core/fpdfapi/page/cpdf_textobject.cpp",
     "core/fpdfapi/page/cpdf_textobject.h",
     "core/fpdfapi/page/cpdf_textstate.cpp",
@@ -479,8 +481,6 @@ static_library("fpdfapi") {
     "core/fpdfapi/page/cpdf_tilingpattern.h",
     "core/fpdfapi/page/fpdf_page_colors.cpp",
     "core/fpdfapi/page/fpdf_page_func.cpp",
-    "core/fpdfapi/page/fpdf_page_parser.cpp",
-    "core/fpdfapi/page/fpdf_page_parser_old.cpp",
     "core/fpdfapi/page/pageint.h",
     "core/fpdfapi/parser/cfdf_document.cpp",
     "core/fpdfapi/parser/cfdf_document.h",
@@ -1634,8 +1634,8 @@ test("pdfium_unittests") {
   sources = [
     "core/fpdfapi/font/fpdf_font_cid_unittest.cpp",
     "core/fpdfapi/font/fpdf_font_unittest.cpp",
-    "core/fpdfapi/page/fpdf_page_parser_old_unittest.cpp",
-    "core/fpdfapi/page/fpdf_page_parser_unittest.cpp",
+    "core/fpdfapi/page/cpdf_streamcontentparser_unittest.cpp",
+    "core/fpdfapi/page/cpdf_streamparser_unittest.cpp",
     "core/fpdfapi/parser/cpdf_array_unittest.cpp",
     "core/fpdfapi/parser/cpdf_document_unittest.cpp",
     "core/fpdfapi/parser/cpdf_object_unittest.cpp",