pdfviewer: fix typo in sample app

gyp/SampleApp.gyp

 {
   'variables': {
     #manually set sample_pdf_file_viewer to 1 to have the PdfViewer in SampleApp
     'sample_pdf_file_viewer%': 0,
   },
   'targets': [
     {
       'target_name': 'SampleApp',
       'type': 'executable',
       'mac_bundle' : 1,
@@ skipping 143 matching lines @@
         'pdf.gyp:pdf',
         'views_animated.gyp:views_animated',
         'lua.gyp:lua',
       ],
      'conditions' : [
        [ 'sample_pdf_file_viewer == 1', {
          'defines': [
            'SAMPLE_PDF_FILE_VIEWER',
          ],
          'dependencies': [
-           'pdfviewer_lib.gyp:libpdfviewer_lib',
+           'pdfviewer_lib.gyp:pdfviewer_lib',
          ],
          'include_dirs' : [
            '../experimental/PdfViewer/',
          ],
          'sources': [
            '../samplecode/SamplePdfFileViewer.cpp',
          ]
        }],
         [ 'skia_os == "win"', {
           'sources!': [
@@ skipping 142 matching lines @@
       },
     },
   ],
 }
 
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