Removing base::ThreadRestrictions::ScopedAllowIO from icon_manager_linux.cc

chrome/browser/icon_loader_mac.mm

Index: chrome/browser/icon_loader_mac.mm
diff --git a/chrome/browser/icon_loader_mac.mm b/chrome/browser/icon_loader_mac.mm
index d01089f61354202a71814a68440d7a96f57c4e66..015dc6bafa783a67921d27b196a2f3026e641e35 100644
--- a/chrome/browser/icon_loader_mac.mm
+++ b/chrome/browser/icon_loader_mac.mm
@@ -7,12 +7,19 @@
 #import <AppKit/AppKit.h>
 
 #include "base/bind.h"
+#include "base/files/file_path.h"
 #include "base/message_loop.h"
 #include "base/threading/thread.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/image/image_skia_util_mac.h"
 
+// static
+IconGroupID IconLoader::ReadGroupIDFromFilepath(
+    const base::FilePath& filepath) {
+  return filepath.Extension();
+}
+
 void IconLoader::ReadIcon() {
   NSString* group = base::SysUTF8ToNSString(group_);
   NSWorkspace* workspace = [NSWorkspace sharedWorkspace];