[Mac] Re-add the NSColor sandbox warmup.

content/common/sandbox_mac.mm

Index: content/common/sandbox_mac.mm
diff --git a/content/common/sandbox_mac.mm b/content/common/sandbox_mac.mm
index 41ad800f0c3eb1cc6dcbfe3c57765497f6ff05ac..9baec00d8ce99f946d47cf651d9bef9aa84a6c4c 100644
--- a/content/common/sandbox_mac.mm
+++ b/content/common/sandbox_mac.mm
@@ -277,6 +277,12 @@ void Sandbox::SandboxWarmup(int sandbox_type) {
         CGColorSpaceCreateWithName(kCGColorSpaceGenericCMYK));
   }
 
+  { // -[NSColor colorUsingColorSpaceName] - 10.5.6
+    // Used in ppapi processes only. http://crbug.com/348304
+    NSColor* color = [NSColor controlTextColor];
+    [color colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
+  }
+
   { // localtime() - 10.5.6
     time_t tv = {0};
     localtime(&tv);