Simplify the disable_pie logic.

Since we only use the variable in one place, move its definition
into that one place.

Review URL: http://codereview.chromium.org/6969045

git-svn-id: http://src.chromium.org/svn/trunk/src/build@85162 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -142,9 +142,6 @@
       # Has no effect if 'clang' is not set as well.
       'clang_use_chrome_plugins%': 0,
 
-      # Allow a user to link Chromium as a non-position independent executable.
-      'disable_pie%': 0,
-
       'conditions': [
         # A flag for POSIX platforms
         ['os_nix==1 or OS=="mac"', {
@@ -230,7 +227,6 @@
     'remoting%': '<(remoting)',
     'p2p_apis%': '<(p2p_apis)',
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
-    'disable_pie%': '<(disable_pie)',
 
     # The release channel that this build targets. This is used to restrict
     # channel-specific build options, like which installer packages to create.