Remove the base.gyp dependency from system.gyp

The dependency is unnecessary and causes build error in the standalone webrtc project due to missing base.gyp when SCTP is enabled (it depends on usrsctp.gyp, which depends on system.gyp). All system.typ needs from base.gyp is the "include_dirs" pointing to ".." relative to "base". So we can remove the dependency on base.gyp and add "include_dirs":["../.."] instead.

BUG=

Review URL: https://codereview.chromium.org/128933005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243863 0039d316-1c4b-4281-b951-d872f2087c98

build/linux/system.gyp

@@ -415,9 +415,6 @@
     {
       'target_name': 'libbrlapi',
       'type': 'static_library',
-      'dependencies': [
-        '../../base/base.gyp:base',
-      ],
       'all_dependent_settings': {
         'include_dirs': [
           '<(SHARED_INTERMEDIATE_DIR)',
@@ -435,6 +432,9 @@
           }],
         ],
       },
+      'include_dirs': [
+        '../..',
+      ],
       'hard_dependency': 1,
       'actions': [
         {