Remove most things GYP.

DEPS

 use_relative_paths = True
 
 vars = {
   'chromium_git': 'https://chromium.googlesource.com',
   'pdfium_git': 'https://pdfium.googlesource.com',
 
   'android_ndk_revision': '5022f40f12953c02b2614c5f7beb981ec5d0e833',
   'build_revision': '76d9f8b4fcae07fb82f28295468cf92bade935bd',
   'buildtools_revision': 'db6179b29f90d28026b0cb23ef71d56ec31b8bd6',
   'catapult_revision': '327256cb1c387e62a2c7e6960e2398867665fb51',
@@ skipping 32 matching lines @@
   "third_party/skia":
     Var('chromium_git') + '/skia.git' + '@' +  Var('skia_revision'),
 
   "tools/clang":
     Var('chromium_git') + "/chromium/src/tools/clang@" +  Var('clang_revision'),
 
   "tools/generate_library_loader":
     Var('chromium_git') + "/chromium/src/tools/generate_library_loader@" +
         Var('gen_library_loader_revision'),
 
+  # TODO(GYP): Remove this when no tools rely on GYP anymore.
   "tools/gyp":
     Var('chromium_git') + '/external/gyp.git' + '@' + 'c61b0b35c8396bfd59efc6cfc11401d912b0f510',
 
   "tools/memory":
     Var('chromium_git') + "/chromium/src/tools/memory@" +
         Var('tools_memory_revision'),
 
   "v8":
     Var('chromium_git') + "/v8/v8.git@" + Var('v8_revision'),
 
@@ skipping 68 matching lines @@
     # This sysroot updates at about the same rate that the chrome build deps
     # change. This script is a no-op except for linux users who are doing
     # official chrome builds or cross compiling.
     'name': 'sysroot',
     'pattern': '.',
     'action': ['python',
                'pdfium/build/linux/sysroot_scripts/install-sysroot.py',
                '--running-as-hook'
     ],
   },
-  {
-    # A change to a .gyp, .gypi, or to GYP itself should run the generator.
-    'name': 'gyp',
-    'pattern': '.',
-    'action': ['python', 'pdfium/build_gyp/gyp_pdfium'],
-  },
   # Pull clang-format binaries using checked-in hashes.
   {
     'name': 'clang_format_win',
     'pattern': '.',
     'action': [ 'download_from_google_storage',
                 '--no_resume',
                 '--platform=win32',
                 '--no_auth',
                 '--bucket', 'chromium-clang-format',
                 '-s', 'pdfium/buildtools/win/clang-format.exe.sha1',
@@ skipping 30 matching lines @@
                '--if-needed'
     ],
   },
   {
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',
     'pattern': '.',
     'action': ['python', 'pdfium/build/vs_toolchain.py', 'update'],
   },
 ]