Disable exceptions for the pdfium targets, now that pdfium:29 is done.

pdfium.gyp

 {
   'variables': {
     'pdf_use_skia%': 0,
   },
   'target_defaults': {
     'defines' : [
       'FOXIT_CHROME_BUILD',
       '_FXFT_VERSION_=2501',
       '_FPDFSDK_LIB',
       '_NO_GDIPLUS_',  # workaround text rendering issues on Windows
     ],
     'conditions': [
       ['pdf_use_skia==1', {
         'defines': ['_SKIA_SUPPORT_'],
       }],
-      # pdfium uses exceptions. Override the default exceptions-off setting
-      # from chromium.
-      # TODO: Instead, change pdfium to not use exceptions, and remove this.
-      ['OS=="mac"', {
-        'xcode_settings': { 'GCC_ENABLE_CPP_EXCEPTIONS': 'YES', },
-      }],
-      ['OS=="win"', {
-        'msvs_settings': { 'VCCLCompilerTool': { 'ExceptionHandling': '1', }, },
-        'defines!': [ '_HAS_EXCEPTIONS=0', ],
-      }],
       ['OS=="linux"', {
-        'cflags!': [ '-fno-exceptions', ],
         'conditions': [
           ['target_arch=="x64"', {
             'defines' : [ '_FX_CPU_=_FX_X64_', ],
             'cflags': [ '-fPIC', ],
           }],
           ['target_arch=="ia32"', {
             'defines' : [ '_FX_CPU_=_FX_X86_', ],
           }],
         ],
       }],
@@ skipping 808 matching lines @@
         'fpdfsdk/src/formfiller/FFL_ListBox.cpp',
         'fpdfsdk/src/formfiller/FFL_Notify.cpp',
         'fpdfsdk/src/formfiller/FFL_PushButton.cpp',
         'fpdfsdk/src/formfiller/FFL_RadioButton.cpp',
         'fpdfsdk/src/formfiller/FFL_TextField.cpp',
         'fpdfsdk/src/formfiller/FFL_Utils.cpp',
       ],
     },
   ],
 }