Clean up visibility and dependencies of RTC event log build targets.

- Remove visibility of encoder target.
- Remove unnecessary dependency on task_queue.
- Remove CreateRtcEventLogFactory() declaration from the rtc_event_log_api target
  since the function is not defined in that target.

Bug: None
Change-Id: Id9edee86f358d08ea063d62bd96e9653c5b06d55
Reviewed-on: https://webrtc-review.googlesource.com/c/116060
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26215}

logging/BUILD.gn

@@ -41,7 +41,6 @@ rtc_source_set("rtc_event_log_api") {
     "../api:libjingle_logging_api",
     "../rtc_base:ptr_util",
     "../rtc_base:rtc_base_approved",
-    "../rtc_base:rtc_task_queue",
     "//third_party/abseil-cpp/absl/memory",
   ]
 }
@@ -158,7 +157,6 @@ rtc_source_set("rtc_event_video") {
 # TODO(eladalon): Break down into (1) encoder and (2) decoder; we don't need
 # the decoder code in the WebRTC library, only in unit tests and tools.
 rtc_static_library("rtc_event_log_impl_encoder") {
-  visibility = [ "*" ]
   sources = [
     "rtc_event_log/encoder/blob_encoding.cc",
     "rtc_event_log/encoder/blob_encoding.h",
@@ -225,6 +223,8 @@ rtc_source_set("rtc_event_log_impl_output") {
 }
 
 rtc_static_library("rtc_event_log_impl_base") {
+  # TODO(terelius): Should this really be visible? Currently used to instantiate
+  # the default event log factory.
   visibility = [ "*" ]
   sources = [
     "rtc_event_log/rtc_event_log_factory.cc",

logging/rtc_event_log/rtc_event_log.h

@@ -16,7 +16,6 @@
 
 #include "api/rtceventlogoutput.h"
 #include "logging/rtc_event_log/events/rtc_event.h"
-#include "rtc_base/task_queue.h"
 
 namespace webrtc {
 

logging/rtc_event_log/rtc_event_log_factory.h

@@ -15,7 +15,6 @@
 
 #include "logging/rtc_event_log/rtc_event_log.h"
 #include "logging/rtc_event_log/rtc_event_log_factory_interface.h"
-#include "rtc_base/task_queue.h"
 
 namespace webrtc {
 

logging/rtc_event_log/rtc_event_log_factory_interface.h

@@ -14,7 +14,6 @@
 #include <memory>
 
 #include "logging/rtc_event_log/rtc_event_log.h"
-#include "rtc_base/task_queue.h"
 
 namespace webrtc {
 
@@ -29,8 +28,6 @@ class RtcEventLogFactoryInterface {
       RtcEventLog::EncodingType encoding_type) = 0;
 };
 
-std::unique_ptr<RtcEventLogFactoryInterface> CreateRtcEventLogFactory();
-
 }  // namespace webrtc
 
 #endif  // LOGGING_RTC_EVENT_LOG_RTC_EVENT_LOG_FACTORY_INTERFACE_H_