linux: Both gtk and the aura port should set the icon theme name.

chrome/browser/icon_loader.cc

Index: chrome/browser/icon_loader.cc
diff --git a/chrome/browser/icon_loader.cc b/chrome/browser/icon_loader.cc
index 39919477640e6295c44c322b3f62171eea2c0556..7683785c21fbad078f7be38ad70396a2024fe5a0 100644
--- a/chrome/browser/icon_loader.cc
+++ b/chrome/browser/icon_loader.cc
@@ -29,11 +29,6 @@ IconLoader::~IconLoader() {
 void IconLoader::Start() {
   target_message_loop_ = base::MessageLoopProxy::current();
 
-#if defined(TOOLKIT_GTK)
-  // This call must happen on the UI thread before we can start loading icons.
-  base::nix::DetectGtkTheme();
-#endif
-
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
       base::Bind(&IconLoader::ReadIcon, this));
 }