ueventd: remove character device symlinks (/dev/usb/*)

While refactoring ueventd, I was looking for code the character device
symlinks (/dev/usb/*) that ueventd creates, such that I could test it
on a real device.  I found none in our tree, and history showing Xoom,
which was last supported years ago, was the last user.  If this code
is in fact obsolete, let's remove it.

Test: boot bullhead
Test: init unit tests

Change-Id: I601f7165eb06d36b31b6dcf69ee9e0a449d81a96
diff --git a/init/devices.h b/init/devices.h
index 5105ad7..c64f5fb 100644
--- a/init/devices.h
+++ b/init/devices.h
@@ -115,16 +115,12 @@
     bool FindPlatformDevice(std::string path, std::string* platform_device_path) const;
     std::tuple<mode_t, uid_t, gid_t> GetDevicePermissions(
         const std::string& path, const std::vector<std::string>& links) const;
-    void MakeDevice(const std::string& path, int block, int major, int minor,
+    void MakeDevice(const std::string& path, bool block, int major, int minor,
                     const std::vector<std::string>& links) const;
-    std::vector<std::string> GetCharacterDeviceSymlinks(const Uevent& uevent) const;
-    void HandleDevice(const std::string& action, const std::string& devpath, int block, int major,
+    void HandleDevice(const std::string& action, const std::string& devpath, bool block, int major,
                       int minor, const std::vector<std::string>& links) const;
     void FixupSysPermissions(const std::string& upath, const std::string& subsystem) const;
 
-    void HandleBlockDeviceEvent(const Uevent& uevent) const;
-    void HandleGenericDeviceEvent(const Uevent& uevent) const;
-
     std::vector<Permissions> dev_permissions_;
     std::vector<SysfsPermissions> sysfs_permissions_;
     std::vector<Subsystem> subsystems_;