Drop build support for non-PDFium engines

Removes support from pdf/BUILD.gn for building with PDF engines other
than PDFium. We do not intend to support other PDF engines going
forward.

Bug: 1076554
Change-Id: Id85f685001cc338bc8839f6f168a738ba4ed338d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302910
Commit-Queue: K. Moon <kmoon@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789652}

pdf/BUILD.gn

@@ -16,14 +16,10 @@ buildflag_header("buildflags") {
 }
 
 if (enable_pdf) {
-  pdf_engine = 0  # 0 PDFium
-
   config("pdf_common_config") {
     configs = [ "//build/config/compiler:noshadowing" ]
 
-    if (pdf_engine == 0) {
-      include_dirs = [ "//third_party/pdfium" ]
-    }
+    include_dirs = [ "//third_party/pdfium" ]
   }
 
   static_library("pdf") {
@@ -60,6 +56,31 @@ if (enable_pdf) {
       "pdf_init.h",
       "pdf_transform.cc",
       "pdf_transform.h",
+      "pdfium/pdfium_api_string_buffer_adapter.cc",
+      "pdfium/pdfium_api_string_buffer_adapter.h",
+      "pdfium/pdfium_assert_matching_enums.cc",
+      "pdfium/pdfium_document.cc",
+      "pdfium/pdfium_document.h",
+      "pdfium/pdfium_engine.cc",
+      "pdfium/pdfium_engine.h",
+      "pdfium/pdfium_engine_exports.cc",
+      "pdfium/pdfium_engine_exports.h",
+      "pdfium/pdfium_form_filler.cc",
+      "pdfium/pdfium_form_filler.h",
+      "pdfium/pdfium_mem_buffer_file_read.cc",
+      "pdfium/pdfium_mem_buffer_file_read.h",
+      "pdfium/pdfium_mem_buffer_file_write.cc",
+      "pdfium/pdfium_mem_buffer_file_write.h",
+      "pdfium/pdfium_page.cc",
+      "pdfium/pdfium_page.h",
+      "pdfium/pdfium_permissions.cc",
+      "pdfium/pdfium_permissions.h",
+      "pdfium/pdfium_print.cc",
+      "pdfium/pdfium_print.h",
+      "pdfium/pdfium_range.cc",
+      "pdfium/pdfium_range.h",
+      "pdfium/pdfium_unsupported_features.cc",
+      "pdfium/pdfium_unsupported_features.h",
       "ppapi_migration/bitmap.cc",
       "ppapi_migration/bitmap.h",
       "ppapi_migration/callback.cc",
@@ -91,56 +112,23 @@ if (enable_pdf) {
       ":features",
       "//base",
       "//base:i18n",
+      "//gin",
       "//net",
+      "//pdf/pdfium/fuzzers",
       "//ppapi/cpp:objects",
       "//ppapi/cpp/private:internal_module",
+      "//printing",
       "//skia",
+      "//third_party/pdfium",
       "//ui/base",
       "//ui/gfx/range",
     ]
 
-    if (pdf_engine == 0) {
+    if (is_linux) {
       sources += [
-        "pdfium/pdfium_api_string_buffer_adapter.cc",
-        "pdfium/pdfium_api_string_buffer_adapter.h",
-        "pdfium/pdfium_assert_matching_enums.cc",
-        "pdfium/pdfium_document.cc",
-        "pdfium/pdfium_document.h",
-        "pdfium/pdfium_engine.cc",
-        "pdfium/pdfium_engine.h",
-        "pdfium/pdfium_engine_exports.cc",
-        "pdfium/pdfium_engine_exports.h",
-        "pdfium/pdfium_form_filler.cc",
-        "pdfium/pdfium_form_filler.h",
-        "pdfium/pdfium_mem_buffer_file_read.cc",
-        "pdfium/pdfium_mem_buffer_file_read.h",
-        "pdfium/pdfium_mem_buffer_file_write.cc",
-        "pdfium/pdfium_mem_buffer_file_write.h",
-        "pdfium/pdfium_page.cc",
-        "pdfium/pdfium_page.h",
-        "pdfium/pdfium_permissions.cc",
-        "pdfium/pdfium_permissions.h",
-        "pdfium/pdfium_print.cc",
-        "pdfium/pdfium_print.h",
-        "pdfium/pdfium_range.cc",
-        "pdfium/pdfium_range.h",
-        "pdfium/pdfium_unsupported_features.cc",
-        "pdfium/pdfium_unsupported_features.h",
+        "pdfium/pdfium_font_linux.cc",
+        "pdfium/pdfium_font_linux.h",
       ]
-
-      deps += [
-        "//gin",
-        "//pdf/pdfium/fuzzers",
-        "//printing",
-        "//third_party/pdfium",
-      ]
-
-      if (is_linux) {
-        sources += [
-          "pdfium/pdfium_font_linux.cc",
-          "pdfium/pdfium_font_linux.h",
-        ]
-      }
     }
   }
 
@@ -209,10 +197,23 @@ if (enable_pdf) {
       "out_of_process_instance_unittest.cc",
       "page_orientation_unittest.cc",
       "pdf_transform_unittest.cc",
+      "pdfium/accessibility_unittest.cc",
+      "pdfium/findtext_unittest.cc",
+      "pdfium/pdfium_engine_exports_unittest.cc",
+      "pdfium/pdfium_engine_unittest.cc",
+      "pdfium/pdfium_form_filler_unittest.cc",
+      "pdfium/pdfium_page_unittest.cc",
+      "pdfium/pdfium_permissions_unittest.cc",
+      "pdfium/pdfium_print_unittest.cc",
+      "pdfium/pdfium_test_base.cc",
+      "pdfium/pdfium_test_base.h",
       "range_set_unittest.cc",
     ]
 
-    configs += [ ":pdf_common_config" ]
+    configs += [
+      ":pdf_common_config",
+      "//v8:external_startup_data",
+    ]
 
     data = [ "test/data/" ]
 
@@ -223,40 +224,20 @@ if (enable_pdf) {
       "//base",
       "//base/test:run_all_unittests",
       "//base/test:test_support",
+      "//gin",
       "//ppapi/c",
       "//ppapi/cpp:objects",
       "//printing",
       "//skia",
       "//testing/gmock",
       "//testing/gtest",
+      "//third_party/pdfium",
       "//ui/gfx/geometry",
       "//ui/gfx/range",
     ]
 
-    if (pdf_engine == 0) {
-      sources += [
-        "pdfium/accessibility_unittest.cc",
-        "pdfium/findtext_unittest.cc",
-        "pdfium/pdfium_engine_exports_unittest.cc",
-        "pdfium/pdfium_engine_unittest.cc",
-        "pdfium/pdfium_form_filler_unittest.cc",
-        "pdfium/pdfium_page_unittest.cc",
-        "pdfium/pdfium_permissions_unittest.cc",
-        "pdfium/pdfium_print_unittest.cc",
-        "pdfium/pdfium_test_base.cc",
-        "pdfium/pdfium_test_base.h",
-      ]
-
-      configs += [ "//v8:external_startup_data" ]
-
-      deps += [
-        "//gin",
-        "//third_party/pdfium",
-      ]
-
-      if (v8_use_external_startup_data) {
-        data += [ "$root_out_dir/snapshot_blob.bin" ]
-      }
+    if (v8_use_external_startup_data) {
+      data += [ "$root_out_dir/snapshot_blob.bin" ]
     }
   }
 } else {