Remove XrRuntimeManager::ForEachRuntime.

This was going to be migrated to use base::FunctionRef, but as there are
no callers, just delete it instead.

Change-Id: I2a7c68aaea9b56a395572b73ca2c48ccfd73827e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5051068
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1228880}

content/browser/xr/service/xr_runtime_manager_impl.cc

@@ -578,13 +578,6 @@ XRRuntimeManagerImpl::GetXrFrameSinkClientFactory() {
   return base::BindRepeating(&FrameSinkClientFactory);
 }
 
-void XRRuntimeManagerImpl::ForEachRuntime(
-    base::RepeatingCallback<void(BrowserXRRuntime*)> fn) {
-  for (auto& runtime : runtimes_) {
-    fn.Run(runtime.second.get());
-  }
-}
-
 std::vector<webxr::mojom::RuntimeInfoPtr>
 XRRuntimeManagerImpl::GetActiveRuntimes() {
   std::vector<webxr::mojom::RuntimeInfoPtr> active_runtimes;

content/browser/xr/service/xr_runtime_manager_impl.h

@@ -97,8 +97,6 @@ class CONTENT_EXPORT XRRuntimeManagerImpl
 
   // XRRuntimeManager implementation
   BrowserXRRuntimeImpl* GetRuntime(device::mojom::XRDeviceId id) override;
-  void ForEachRuntime(
-      base::RepeatingCallback<void(BrowserXRRuntime*)> fn) override;
 
   content::WebXrLoggerManager& GetLoggerManager();
 

content/public/browser/xr_runtime_manager.h

@@ -49,11 +49,6 @@ class CONTENT_EXPORT XRRuntimeManager {
   // XRDeviceId, or nullptr if no such device exists/has been registered.
   virtual content::BrowserXRRuntime* GetRuntime(
       device::mojom::XRDeviceId id) = 0;
-
-  // Provides a mechanism for performing operations on/reasoning about all
-  // currently active runtimes, without exposing the collection.
-  virtual void ForEachRuntime(
-      base::RepeatingCallback<void(content::BrowserXRRuntime*)> fn) = 0;
 };
 
 }  // namespace content