bluetooth: disable NewBLEGattSessionHandling feature

This feature gates a new implementation of GATT session handling on
Windows that uses a supposedly more reliable set of Windows Bluetooth
APIs, but ended up breaking GATT connection establishment with unpaired
devices.

Disable the feature and fall back to the old implementation.

Bug: 1120338
Change-Id: I4241747791d3875cfbdecd71fd2e0d41f0e82fa2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378143Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#802017}

device/base/features.cc

@@ -19,8 +19,10 @@ const base::Feature kNewBLEWinImplementation{"NewBLEWinImplementation",
 
 // Controls whether a more reliable GATT session handling
 // implementation is used on Windows 10 1709 (RS3) and beyond.
+//
+// Disabled due to crbug/1120338.
 const base::Feature kNewBLEGattSessionHandling{
-    "NewBLEGattSessionHandling", base::FEATURE_ENABLED_BY_DEFAULT};
+    "NewBLEGattSessionHandling", base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_WIN)
 
 #if BUILDFLAG(ENABLE_VR)