Remove unused in-process pepper APIs

ppapi/ppapi_shared.gypi

Index: ppapi/ppapi_shared.gypi
diff --git a/ppapi/ppapi_shared.gypi b/ppapi/ppapi_shared.gypi
index 6e6f90b7bec93a0271aae606aaf86f9323fd6985..9a8c4ce719801c948cfad16746f4044c4fc9bafb 100644
--- a/ppapi/ppapi_shared.gypi
+++ b/ppapi/ppapi_shared.gypi
@@ -244,8 +244,6 @@
           'thunk/ppb_platform_verification_private_thunk.cc',
           'thunk/ppb_printing_api.h',
           'thunk/ppb_printing_dev_thunk.cc',
-          'thunk/ppb_scrollbar_api.h',
-          'thunk/ppb_scrollbar_thunk.cc',
           'thunk/ppb_tcp_server_socket_private_api.h',
           'thunk/ppb_tcp_server_socket_private_thunk.cc',
           'thunk/ppb_tcp_socket_api.h',
@@ -291,11 +289,8 @@
           'thunk/ppb_view_thunk.cc',
           'thunk/ppb_websocket_api.h',
           'thunk/ppb_websocket_thunk.cc',
-          'thunk/ppb_widget_api.h',
-          'thunk/ppb_widget_dev_thunk.cc',
           'thunk/ppb_x509_certificate_private_api.h',
           'thunk/ppb_x509_certificate_private_thunk.cc',
-          'thunk/ppb_zoom_dev_thunk.cc',
           'thunk/thunk.h',
         ],
         'defines': [
@@ -334,7 +329,6 @@
               'thunk/ppb_gles_chromium_texture_mapping_thunk.cc',
               'thunk/ppb_pdf_thunk.cc',
               'thunk/ppb_platform_verification_private_thunk.cc',
-              'thunk/ppb_scrollbar_thunk.cc',
               'thunk/ppb_transport_thunk.cc',
               'thunk/ppb_url_util_thunk.cc',
               'thunk/ppb_video_capture_thunk.cc',