Revert of linux/gyp: Find missing symbols at build time, not runtime.

content/content_shell.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'content_shell_product_name': 'Content Shell',
     # The "19" is so that sites that sniff for version think that this is
     # something reasonably current; the "77.34.5" is a hint that this isn't a
     # standard Chrome.
@@ skipping 714 matching lines @@
           'xcode_settings': {
             'GCC_SYMBOLS_PRIVATE_EXTERN': 'NO',
             'INFOPLIST_FILE': 'shell/tools/plugin/mac/Info.plist',
           },
         }],
         ['os_posix == 1 and OS != "mac"', {
           'cflags': [
             '-fvisibility=default',
           ],
         }],
-        ['OS == "linux"', {
-          'dependencies': [ '../build/linux/system.gyp:x11' ],
-        }],
         ['OS=="win"', {
           'defines': [
             # This seems like a hack, but this is what Safari Win does.
             'snprintf=_snprintf',
           ],
           'sources': [
             'shell/tools/plugin/win/TestNetscapePlugin.def',
             'shell/tools/plugin/win/TestNetscapePlugin.rc',
           ],
           # The .rc file requires that the name of the dll is np_test_netscape_plugin.dll.
@@ skipping 418 matching lines @@
                 '--input_symbol', '<(PRODUCT_DIR)/content_shell.exe.pdb',
                 '--destination_dir', '<(dest_dir)',
               ],
             },
           ],
         },
       ],
     }],  # OS=="win" and fastbuild==0 and target_arch=="ia32"
   ]
 }