Clean up PDF plugin dependencies.

pdf/pdf.gyp

Index: pdf/pdf.gyp
diff --git a/pdf/pdf.gyp b/pdf/pdf.gyp
index f70f1935bd566d1c923f69ca7f5aec25bf8eaa61..06ce3043f0ffd9c052a5577c0522a67fe00ff6f6 100644
--- a/pdf/pdf.gyp
+++ b/pdf/pdf.gyp
@@ -10,13 +10,10 @@
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
-        '../components/components.gyp:ui_zoom',
-        '../content/content.gyp:content_common',
         '../gin/gin.gyp:gin',
         '../net/net.gyp:net',
         '../ppapi/ppapi.gyp:ppapi_cpp_objects',
         '../ppapi/ppapi.gyp:ppapi_internal_module',
-        '../third_party/pdfium/pdfium.gyp:pdfium',
       ],
       'ldflags': [ '-L<(PRODUCT_DIR)',],
       'sources': [
@@ -40,6 +37,9 @@
       ],
       'conditions': [
         ['pdf_engine==0', {
+          'dependencies': [
+            '../third_party/pdfium/pdfium.gyp:pdfium',
+          ],
           'sources': [
             'pdfium/pdfium_api_string_buffer_adapter.cc',
             'pdfium/pdfium_api_string_buffer_adapter.h',