Refactor to move chrome_page_zoom functions to components/ui/zoom.

pdf/BUILD.gn

 # Copyright 2014 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.
 
 pdf_engine = 0  # 0 PDFium
 
 # TODO(GYP) need support for loadable modules
 shared_library("pdf") {
   sources = [
     "button.h",
@@ skipping 27 matching lines @@
     "pdf.rc",
     "progress_control.cc",
     "progress_control.h",
     "pdf_engine.h",
     "preview_mode_client.cc",
     "preview_mode_client.h",
     "resource.h",
     "resource_consts.h",
     "thumbnail_control.cc",
     "thumbnail_control.h",
-    "../chrome/browser/chrome_page_zoom_constants.cc",
+    "../components/ui/zoom/page_zoom_constants.cc",
     "../content/common/page_zoom.cc",
   ]
 
   if (pdf_engine == 0) {
     sources += [
       "pdfium/pdfium_assert_matching_enums.cc",
       "pdfium/pdfium_engine.cc",
       "pdfium/pdfium_engine.h",
       "pdfium/pdfium_mem_buffer_file_read.cc",
       "pdfium/pdfium_mem_buffer_file_read.h",
@@ skipping 30 matching lines @@
   }
 
   deps = [
     "//base",
     "//net",
     "//ppapi:ppapi_cpp",
     "//third_party/pdfium",
   ]
 }
 # TODO(GYP) pdf_linux_symbols target.