Fix build error on Windows stand alone build.

pdfium.gyp

 {
   'variables': {
     'win_third_party_warn_as_error': 'false',
     'pdf_use_skia%': 0,
   },
   'target_defaults': {
     'defines' : [
       'FOXIT_CHROME_BUILD',
       '_FXFT_VERSION_=2501',
       '_FPDFSDK_LIB',
@@ skipping 101 matching lines @@
         'fpdfsdk/src/resource.h',
         'fpdfsdk/include/fpdf_transformpage.h',
         'fpdfsdk/src/fpdf_transformpage.cpp',
       ],
       'conditions': [
         ['OS!="win"', {
           'sources!': [
             'fpdfsdk/src/fpdfsdkdll.rc',
           ],
         }],
-        ['OS=="mac"', {
-          'link_settings': {
-            'libraries': [
-              '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
-              '$(SDKROOT)/System/Library/Frameworks/CoreFoundation.framework',
+      ],
+      'all_dependent_settings': {
+        'msvs_settings': {
+          'VCLinkerTool': {
+            'AdditionalDependencies': [
+              'advapi32.lib',
+              'gdi32.lib',
+              'user32.lib',
             ],
           },
-        }],
-      ],
-      'msvs_settings': {
-        'VCLinkerTool': {
-          'AdditionalDependencies': [
-            'advapi32.lib',
-            'gdi32.lib',
-            'user32.lib',
-          ],
         },
+        'conditions': [
+          ['OS=="mac"', {
+            'link_settings': {
+              'libraries': [
+                '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
+                '$(SDKROOT)/System/Library/Frameworks/CoreFoundation.framework',
+              ],
+            },
+          }],
+        ],
       },
     },
     {
       'target_name': 'fdrm',
       'type': 'static_library',
       'ldflags': [ '-L<(PRODUCT_DIR)',],
       'sources': [
         'core/include/fdrm/fx_crypt.h',
         'core/src/fdrm/crypto/fx_crypt.cpp',
         'core/src/fdrm/crypto/fx_crypt_aes.cpp',
@@ skipping 682 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',
       ],
     },
   ],
 }