Make the Mac Info.plist SCM keys generic

content/content_shell.gypi

Index: content/content_shell.gypi
diff --git a/content/content_shell.gypi b/content/content_shell.gypi
index e97e80258d9159e48b78a0187178871e862c1899..473c86874ce377b12170f8eacfe566f86eb9b3ed 100644
--- a/content/content_shell.gypi
+++ b/content/content_shell.gypi
@@ -389,7 +389,7 @@
               # Modify the Info.plist as needed.
               'postbuild_name': 'Tweak Info.plist',
               'action': ['../build/mac/tweak_info_plist.py',
-                         '--svn=1'],
+                         '--scm=1'],
             },
             {
               # This postbuid step is responsible for creating the following
@@ -499,14 +499,14 @@
             {
               # Modify the Info.plist as needed.  The script explains why this
               # is needed.  This is also done in the chrome and chrome_dll
-              # targets.  In this case, --breakpad=0, --keystone=0, and --svn=0
-              # are used because Breakpad, Keystone, and Subversion keys are
+              # targets.  In this case, --breakpad=0, --keystone=0, and --scm=0
+              # are used because Breakpad, Keystone, and SCM keys are
               # never placed into the helper.
               'postbuild_name': 'Tweak Info.plist',
               'action': ['../build/mac/tweak_info_plist.py',
                          '--breakpad=0',
                          '--keystone=0',
-                         '--svn=0'],
+                         '--scm=0'],
             },
             {
               # Make sure there isn't any Objective-C in the helper app's