Use in-class initializers for base::WeakPtrFactory (all remaining uses on Linux desktop).

Changed NULL to nullptr where the presubmit complained (due to new line wrapping).

Generated by: https://chromium-review.googlesource.com/c/chromium/src/+/1689216

Bug: 981415
Tbr: [email protected],[email protected],[email protected]
Change-Id: Icd574b69f75ead6dc6f34e7b4edcd52a53830640
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1702744
Reviewed-by: Jeremy Roman <[email protected]>
Reviewed-by: Mihai Sardarescu <[email protected]>
Reviewed-by: Raymes Khoury <[email protected]>
Reviewed-by: Gabriel Charette <[email protected]>
Reviewed-by: Sergey Ulanov <[email protected]>
Reviewed-by: Yuwei Huang <[email protected]>
Reviewed-by: Reilly Grant <[email protected]>
Reviewed-by: Ken Rockot <[email protected]>
Reviewed-by: Marc Treib <[email protected]>
Reviewed-by: Rayan Kanso <[email protected]>
Reviewed-by: Victor Costan <[email protected]>
Reviewed-by: Ryo Hashimoto <[email protected]>
Reviewed-by: Tom Sepez <[email protected]>
Commit-Queue: Jeremy Roman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#686003}
diff --git a/remoting/test/ftl_services_playground.cc b/remoting/test/ftl_services_playground.cc
index d209e93..24f8b3f 100644
--- a/remoting/test/ftl_services_playground.cc
+++ b/remoting/test/ftl_services_playground.cc
@@ -44,7 +44,7 @@
 
 namespace remoting {
 
-FtlServicesPlayground::FtlServicesPlayground() : weak_factory_(this) {}
+FtlServicesPlayground::FtlServicesPlayground() {}
 
 FtlServicesPlayground::~FtlServicesPlayground() = default;