Raise FD limit on Mac for simple cache backend performance.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 86ca49dd2e1bc503cf6faaab06b07b87be56ce61..95eea523e288a405a1ba08734f85ff2de0115abf 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -511,17 +511,16 @@ void BrowserMainLoop::EarlyInitialization() {
   if (parts_)
     parts_->PreEarlyInitialization();
 
-#if defined(OS_MACOSX)
-  // We use quite a few file descriptors for our IPC, and the default limit on
-  // the Mac is low (256), so bump it up.
-  base::SetFdLimit(1024);
-#elif defined(OS_LINUX)
+#if defined(OS_MACOSX) || defined(OS_LINUX)
+  // We use quite a few file descriptors for our IPC as well as disk the disk
+  // cache,and the default limit on the Mac is low (256), so bump it up.
+
   // Same for Linux. The default various per distro, but it is 1024 on Fedora.
   // Low soft limits combined with liberal use of file descriptors means power
   // users can easily hit this limit with many open tabs. Bump up the limit to
   // an arbitrarily high number. See https://crbug.com/539567
   base::SetFdLimit(8192);
-#endif  // default(OS_MACOSX)
+#endif  // defined(OS_MACOSX) || defined(OS_LINUX)
 
 #if defined(OS_WIN)
   net::EnsureWinsockInit();