Remove use_system_v8 logic from the mainline gyp file

Re-upload of https://codereview.chromium.org/14872005/

BUG=chromium:226860
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/15001031

Patch from Paweł Hajdan Jr. <phajdan.jr@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14682 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

build/common.gypi

@@ -29,7 +29,6 @@
 
 {
   'variables': {
-    'use_system_v8%': 0,
     'msvs_use_common_release': 0,
     'gcc_version%': 'unknown',
     'CXX%': '${CXX:-$(which g++)}',  # Used to assemble a shell command.

tools/gyp/v8.gyp

@@ -27,8 +27,6 @@
 
 {
   'includes': ['../../build/common.gypi'],
-  'conditions': [
-    ['use_system_v8==0', {
   'targets': [
     {
       'target_name': 'v8',
@@ -925,80 +923,4 @@
       ],
     },
   ],
-    }, {  # use_system_v8 != 0
-      'targets': [
-        {
-          'target_name': 'v8',
-          'type': 'none',
-          'conditions': [
-            ['want_separate_host_toolset==1', {
-              'toolsets': ['host', 'target'],
-            }, {
-              'toolsets': ['target'],
-            }],
-          ],
-          'variables': {
-            'shim_headers_path': '<(SHARED_INTERMEDIATE_DIR)/shim_headers/<(_target_name)/<(_toolset)',
-          },
-          'include_dirs++': [
-            '<(shim_headers_path)',
-          ],
-          'all_dependent_settings': {
-            'include_dirs+++': [
-              '<(shim_headers_path)',
-            ],
-          },
-          'actions': [
-            {
-              'variables': {
-                'generator_path': '../../../tools/generate_shim_headers/generate_shim_headers.py',
-                'generator_args': [
-                  '--headers-root', '../../include',
-                  '--output-directory', '<(shim_headers_path)',
-                  'v8-debug.h',
-                  'v8-preparser.h',
-                  'v8-profiler.h',
-                  'v8-testing.h',
-                  'v8.h',
-                  'v8stdint.h',
-                ],
-              },
-              'action_name': 'generate_<(_target_name)_shim_headers',
-              'inputs': [
-                '<(generator_path)',
-              ],
-              'outputs': [
-                '<!@pymod_do_main(generate_shim_headers <@(generator_args) --outputs)',
-              ],
-              'action': ['python',
-                         '<(generator_path)',
-                         '<@(generator_args)',
-                         '--generate',
-              ],
-              'message': 'Generating <(_target_name) shim headers.',
-            },
-          ],
-          'link_settings': {
-            'libraries': [
-              '-lv8',
-            ],
-          },
-        },
-        {
-          'target_name': 'v8_shell',
-          'type': 'none',
-          'conditions': [
-            ['want_separate_host_toolset==1', {
-              'toolsets': ['host'],
-            }, {
-              'toolsets': ['target'],
-            }],
-          ],
-          'dependencies': [
-            'v8'
-          ],
-        },
-      ],
-    }],
-  ],
 }