Remove the deprecated NewTracer from OC bridge (#4706)

* Remove the deprecated NewTracer from OC bridge

* Update PR number in changelog

* Remove example test for NewTracer

---------

Co-authored-by: David Ashpole <dashpole@google.com>

CHANGELOG.md

@@ -8,6 +8,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Removed
+
+- Remove the deprecated `go.opentelemetry.io/otel/bridge/opencensus.NewTracer`. (#4706)
+
 ## [1.20.0/0.43.0] 2023-11-10
 
 This release brings a breaking change for custom trace API implementations. Some interfaces (`TracerProvider`, `Tracer`, `Span`) now embed the `go.opentelemetry.io/otel/trace/embedded` types. Implementors need to update their implementations based on what they want the default behavior to be. See the "API Implementations" section of the [trace API] package documentation for more information about how to accomplish this.

bridge/opencensus/example_test.go

@@ -15,21 +15,10 @@
 package opencensus_test
 
 import (
-	octrace "go.opencensus.io/trace"
-
-	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/bridge/opencensus"
 	"go.opentelemetry.io/otel/sdk/metric"
 )
 
-func ExampleNewTracer() {
-	// Create an OpenTelemetry Tracer to use to record spans.
-	tracer := otel.GetTracerProvider().Tracer("go.opentelemetry.io/otel/bridge/opencensus")
-	// Overwrite the OpenCensus DefaultTracer so that it uses OpenTelemetry
-	// rather than OpenCensus.
-	octrace.DefaultTracer = opencensus.NewTracer(tracer)
-}
-
 func ExampleNewMetricProducer() {
 	// Create the OpenCensus Metric bridge.
 	bridge := opencensus.NewMetricProducer()

bridge/opencensus/trace.go

@@ -23,15 +23,6 @@ import (
 	"go.opentelemetry.io/otel/trace"
 )
 
-// NewTracer returns an implementation of the OpenCensus Tracer interface which
-// uses OpenTelemetry APIs.  Using this implementation of Tracer "upgrades"
-// libraries that use OpenCensus to OpenTelemetry to facilitate a migration.
-//
-// Deprecated: Use InstallTraceBridge instead.
-func NewTracer(tracer trace.Tracer) octrace.Tracer {
-	return internal.NewTracer(tracer)
-}
-
 // InstallTraceBridge installs the OpenCensus trace bridge, which overwrites
 // the global OpenCensus tracer implementation. Once the bridge is installed,
 // spans recorded using OpenCensus are redirected to the OpenTelemetry SDK.