Move enable_pdf to a buildflag header.

chrome/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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/compiler/pgo/pgo.gni")
 import("//build/config/features.gni")
 import("//build/config/locales.gni")
@@ skipping 221 matching lines @@
       deps += [
         # On Linux, link the dependencies (libraries) that make up actual
         # Chromium functionality directly into the executable.
         ":browser_dependencies",
         ":child_dependencies",
         ":manpage",
 
         # Needed to use the master_preferences functions
         "//chrome/installer/util:with_no_strings",
         "//content/public/app:both",
+        "//pdf",
 
         # For headless mode.
         "//headless:headless_shell_lib",
       ]
-      if (enable_plugins && enable_pdf) {
-        deps += [ "//pdf" ]
-      }
 
       public_deps = [
         ":xdg_mime",  # Needs to be public for installer to consume files.
         "//chrome/common:features",
       ]
 
       ldflags = [ "-pie" ]
 
       if (use_pango || use_cairo) {
         # Needed for chrome_main.cc initialization of libraries.
@@ skipping 112 matching lines @@
       deps += [ "//ui/compositor" ]
     }
 
     if (is_multi_dll_chrome) {
       defines += [ "CHROME_MULTIPLE_DLL_BROWSER" ]
       deps += [ "//content/public/app:browser" ]
     } else {
       deps += [
         ":child_dependencies",
         "//content/public/app:both",
+        "//pdf",
       ]
     }
 
-    if (enable_plugins && enable_pdf && !is_multi_dll_chrome) {
-      deps += [ "//pdf" ]
-    }
-
     if (enable_package_mash_services) {
       deps += [ "//chrome/app/mash" ]
     }
   }
 
   if (is_multi_dll_chrome) {
     # This manifest matches what GYP produced. It may not even be necessary.
     windows_manifest("chrome_child_manifest") {
       sources = [
         as_invoker_manifest,
@@ skipping 15 matching lines @@
         ":child_dependencies",
         ":chrome_child_manifest",
         ":chrome_dll_version",
         "//build/config/sanitizers:deps",
         "//chrome/browser/policy:path_parser",
         "//chrome/common:features",
         "//chrome/install_static:install_static_util",
         "//components/browser_watcher:browser_watcher_client",
         "//components/crash/content/app",
         "//content/public/app:child",
+        "//pdf",
       ]
 
       ldflags = [
         "/DELAYLOAD:d3d11.dll",
         "/DELAYLOAD:d3d9.dll",
         "/DELAYLOAD:dwmapi.dll",
         "/DELAYLOAD:dxva2.dll",
         "/DELAYLOAD:esent.dll",
         "/DELAYLOAD:wininet.dll",
       ]
 
       if (symbol_level == 2) {
         # Incremental linking doesn't work on this target in debug mode with
         # full symbols, but does work in other cases, including minimal
         # symbols.
         configs -= [ "//build/config/win:default_incremental_linking" ]
         configs += [ "//build/config/win:no_incremental_linking" ]
       }
       configs += [ "//build/config/compiler/pgo:default_pgo_flags" ]
-
-      if (enable_plugins && enable_pdf) {
-        deps += [ "//pdf" ]
-      }
     }
   }
   copy("copy_first_run") {
     sources = [
       "app/firstRun",
     ]
     outputs = [
       "$root_out_dir/First Run",
     ]
   }
@@ skipping 517 matching lines @@
     ]
 
     deps = [
       ":browser_dependencies",
       ":child_dependencies",
       "//chrome/app:command_ids",
       "//chrome/common:features",
       "//components/crash/content/app",
       "//components/policy:generated",
       "//content/public/app:both",
+      "//pdf",
       "//third_party/cld",
     ]
 
     if (is_component_build) {
       libs = [ "Carbon.framework" ]
     }
 
     ldflags = [
       "-Wl,-order_file",
       "-Wl," + rebase_path("app/framework.order", root_build_dir),
       "-ObjC",
     ]
 
-    if (enable_plugins && enable_pdf) {
-      deps += [ "//pdf" ]
-    }
-
     if (enable_package_mash_services) {
       deps += [ "//chrome/app/mash" ]
     }
 
     configs += [ "//build/config/compiler:wexit_time_destructors" ]
   }
 
   mac_framework_bundle("chrome_framework") {
     output_name = chrome_framework_name
 
@@ skipping 594 matching lines @@
       "//chrome/app/theme/$branding_path_component/product_logo_48.png",
       "//chrome/tools/build/linux/chrome-wrapper",
       "//third_party/xdg-utils/scripts/xdg-mime",
       "//third_party/xdg-utils/scripts/xdg-settings",
     ]
     outputs = [
       "$root_out_dir/{{source_file_part}}",
     ]
   }
 }