Make the gyp files more cross-platform across the Unices

chrome/chrome_common.gypi

Index: chrome/chrome_common.gypi
diff --git a/chrome/chrome_common.gypi b/chrome/chrome_common.gypi
index 1ae861b9c69421b05b9c7bc7dc1c4d714b06ea22..2a9b60aeb28442c2f8cdcd7a3f77692e7bc5ec64 100644
--- a/chrome/chrome_common.gypi
+++ b/chrome/chrome_common.gypi
@@ -256,7 +256,7 @@
         'common/zip.h',
       ],
       'conditions': [
-        ['OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+        ['toolkit_uses_gtk==1', {

[Evan Stade, 2011/05/17 00:46:12]

wow, we are really inconsistent about putting spaces around operators in gyp
files. But I think we do want them as per the python style guidelines.

           'dependencies': [
             '../build/linux/system.gyp:gtk',
           ],
@@ -272,7 +272,7 @@
             ],
           },
         },],
-        [ 'OS == "linux" or OS == "freebsd" or OS == "openbsd" or OS == "solaris"', {
+        [ 'os_posix==1 and OS!="mac"', {
           'include_dirs': [
             '<(SHARED_INTERMEDIATE_DIR)',
           ],
@@ -387,7 +387,7 @@
         '../third_party/icu/icu.gyp:icuuc',
       ],
       'conditions': [
-        [ 'OS == "linux" or OS == "freebsd" or OS == "openbsd"', {
+        [ 'os_posix==1 and OS!="mac"', {

[Evan Stade, 2011/05/17 00:46:12]

I guess to be consistent there should be no space between [ and ' (here and
elsewhere)

             'conditions': [
               ['use_openssl==1', {
                  'dependencies': [