PdfMetafileSkia gives out a SkCanvas, not a SkBaseDevice.

skia/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 if (cpu_arch == "arm") {
   import("//build/config/arm.gni")
 }
 
@@ skipping 294 matching lines @@
     "ext/skia_utils_base.h",
     "ext/skia_utils_ios.mm",
     "ext/skia_utils_ios.h",
     "ext/skia_utils_mac.mm",
     "ext/skia_utils_mac.h",
     "ext/skia_utils_win.cc",
     "ext/skia_utils_win.h",
     "ext/vector_canvas.h",
     "ext/vector_platform_device_emf_win.cc",
     "ext/vector_platform_device_emf_win.h",
-    "ext/vector_platform_device_skia.cc",
-    "ext/vector_platform_device_skia.h",
   ]
 
   # The skia gypi values are relative to the skia_dir, so we need to rebase.
   sources += gypi_skia_core.sources
   sources += gypi_skia_effects.sources
   sources += gypi_skia_utils.sources
   sources += gypi_skia_pdf.sources
   sources += gypi_values.skia_library_sources
 
   if (cpu_arch == "arm") {
@@ skipping 92 matching lines @@
       "//third_party/skia/src/utils/win/SkAutoCoInitialize.cpp",
       "//third_party/skia/src/utils/win/SkIStream.cpp",
       "//third_party/skia/src/utils/win/SkWGL_win.cpp",
     ]
   }
 
   # Fixup Chrome sources.
   if (is_posix) {
     sources -= [ "ext/SkThread_chrome.cc" ]
   }
-  if (is_ios) {
-    sources -= [ "ext/vector_platform_device_skia.cc" ]
-  }
   if (is_win) {
     sources -= [ "ext/SkThread_chrome.cc" ]
   }
   if (is_android && (!enable_basic_printing && !enable_print_preview)) {
     sources -= [
       "ext/skia_utils_base.cc",
-      "ext/vector_platform_device_skia.cc"
     ]
   }
 
   # Fixup skia library sources.
   if (is_win) {
     sources -= [
       "//third_party/skia/src/ports/SkOSFile_posix.cpp",
       "//third_party/skia/src/ports/SkTime_Unix.cpp",
       "//third_party/skia/src/ports/SkTLS_pthread.cpp",
     ]
@@ skipping 269 matching lines @@
     ":skia_library_config",
     "//build/config/compiler:no_chromium_code"
   ]
 
   deps = [
     "//base",
   ]
 
   visibility = [ ":skia" ]
 }