Revert of [Ozone] Properly initialize multitouch slot values

ui/events/ozone/evdev/event_device_info.cc

Index: ui/events/ozone/evdev/event_device_info.cc
diff --git a/ui/events/ozone/evdev/event_device_info.cc b/ui/events/ozone/evdev/event_device_info.cc
index d9bd17f15f2b4ac72ccf2bf81eb498dbc03ec983..6d75ea9e0c7272cb0726c5052ea41e3e12d9dc19 100644
--- a/ui/events/ozone/evdev/event_device_info.cc
+++ b/ui/events/ozone/evdev/event_device_info.cc
@@ -37,24 +37,6 @@
     DLOG(ERROR) << "failed EVIOCGABS(" << code << ") on fd " << fd;
     return false;
   }
-  return true;
-}
-
-// |request| needs to be the equivalent to:
-// struct input_mt_request_layout {
-//   uint32_t code;
-//   int32_t values[num_slots];
-// };
-//
-// |size| is num_slots + 1 (for code).
-bool GetSlotValues(int fd, int32_t* request, unsigned int size) {
-  if (ioctl(fd,
-            EVIOCGMTSLOTS(sizeof(int32_t) * size),
-            request) < 0) {
-    LOG(ERROR) << "failed EVIOCGMTSLOTS(" << request[0] << ") on fd " << fd;
-    return false;
-  }
-
   return true;
 }
 
@@ -103,20 +85,6 @@
     if (HasAbsEvent(i))
       if (!GetAbsInfo(fd, i, &abs_info_[i]))
         return false;
-
-  int max_num_slots = abs_info_[ABS_MT_SLOT].maximum + 1;
-  // |request| is MT code + slots.
-  int32_t request[max_num_slots + 1];
-  for (unsigned int i = ABS_MT_SLOT + 1; i < ABS_MAX; ++i) {
-    memset(request, 0, sizeof(request));
-    request[0] = i;
-    if (HasAbsEvent(i))
-      if (!GetSlotValues(fd, request, max_num_slots + 1))
-        return false;
-
-    slot_values_[i - ABS_MT_SLOT - 1].assign(
-        request + 1, request + max_num_slots + 1);
-  }
 
   return true;
 }
@@ -177,14 +145,6 @@
   return abs_info_[code].maximum;
 }
 
-int32 EventDeviceInfo::GetSlotValue(unsigned int code,
-                                    unsigned int slot) const {
-  const std::vector<int32_t>& slots = GetMtSlotsForCode(code);
-  DCHECK_LE(0u, slot) << slot << " is an invalid slot";
-  DCHECK_LT(slot, slots.size()) << slot << " is an invalid slot";
-  return slots[slot];
-}
-
 bool EventDeviceInfo::HasAbsXY() const {
   if (HasAbsEvent(ABS_X) && HasAbsEvent(ABS_Y))
     return true;
@@ -222,12 +182,4 @@
   return true;
 }
 
-const std::vector<int32_t>& EventDeviceInfo::GetMtSlotsForCode(int code) const {
-  int index = code - ABS_MT_SLOT - 1;
-  DCHECK_LE(0, index) << code << " is not a valid multi-touch code";
-  DCHECK_LT(index, EVDEV_ABS_MT_COUNT)
-      << code << " is not a valid multi-touch code";
-  return slot_values_[index];
-}
-
 }  // namespace ui