Modernize equality operators in //services

This CL is pure clean-up and contains no functionality changes.
Depending on the files covered in the CL (since the CL was generated
using git cl split), it does a subset of the following:
the following:
- Remove unneeded operator!= declarations/definitions since C++20 can
  automatically derive those from operator==.
- Default operator== where this is equivalent to the current behavior.
- Default operator<=> where this is equivalent to the current
  behavior.

This CL was uploaded by git cl split.

R=ryansturm@chromium.org

Bug: 40256175
Change-Id: I5cd7a36365142d26f8b097a766f85db5cb4b344d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6538148
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Auto-Submit: Jan Keitel <jkeitel@google.com>
Cr-Commit-Position: refs/heads/main@{#1459553}

services/network/resource_scheduler/resource_scheduler.cc

@@ -153,14 +153,8 @@ struct ResourceScheduler::RequestPriorityParams {
   RequestPriorityParams(net::RequestPriority priority, int intra_priority)
       : priority(priority), intra_priority(intra_priority) {}
 
-  bool operator==(const RequestPriorityParams& other) const {
-    return (priority == other.priority) &&
-           (intra_priority == other.intra_priority);
-  }
-
-  bool operator!=(const RequestPriorityParams& other) const {
-    return !(*this == other);
-  }
+  friend bool operator==(const RequestPriorityParams&,
+                         const RequestPriorityParams&) = default;
 
   bool GreaterThan(const RequestPriorityParams& other) const {
     if (priority != other.priority)