Remove som GYP annotations, remove unused manifest.

printing/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/config/features.gni")
 import("//build/config/sysroot.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
@@ skipping 274 matching lines @@
                          [
                            "--libs-for-gn",
                            cups_sysroot,
                          ],
                          "value")
     }
   }
 }
 
 if (is_android) {
-  # GYP: //printing/printing.gyp:printing_jni_headers
   generate_jni("printing_jni_headers") {
     sources = [
       "android/java/src/org/chromium/printing/PrintingContext.java",
     ]
     jni_package = "printing"
   }
 
-  # GYP: //printing/printing.gyp:printing_java
   android_library("printing_java") {
     deps = [
       "//base:base_java",
     ]
     java_files = [
       "android/java/src/org/chromium/printing/PrintDocumentAdapterWrapper.java",
       "android/java/src/org/chromium/printing/PrintManagerDelegate.java",
       "android/java/src/org/chromium/printing/PrintManagerDelegateImpl.java",
       "android/java/src/org/chromium/printing/Printable.java",
       "android/java/src/org/chromium/printing/PrintingContext.java",
       "android/java/src/org/chromium/printing/PrintingContextInterface.java",
       "android/java/src/org/chromium/printing/PrintingController.java",
       "android/java/src/org/chromium/printing/PrintingControllerImpl.java",
     ]
   }
 }