[Cleanup] Add missing #include. Remove useless ones. IWYU part 2.

This is a follow-up to
https://webrtc-review.googlesource.com/c/src/+/106280.
This time the whole code base is covered.
Some files may have not been fixed though, whenever the IWYU tool
was breaking the build.

Bug: webrtc:8311
Change-Id: I2c31f552a87e887d33931d46e87b6208b1e483ef
Reviewed-on: https://webrtc-review.googlesource.com/c/111965
Commit-Queue: Yves Gerey <yvesg@google.com>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25830}
diff --git a/api/test/fake_frame_decryptor.h b/api/test/fake_frame_decryptor.h
index bcb8080..e2bcf68 100644
--- a/api/test/fake_frame_decryptor.h
+++ b/api/test/fake_frame_decryptor.h
@@ -11,9 +11,13 @@
 #ifndef API_TEST_FAKE_FRAME_DECRYPTOR_H_
 #define API_TEST_FAKE_FRAME_DECRYPTOR_H_
 
+#include <stddef.h>
+#include <stdint.h>
 #include <vector>
 
+#include "api/array_view.h"
 #include "api/crypto/framedecryptorinterface.h"
+#include "api/mediatypes.h"
 #include "rtc_base/refcountedobject.h"
 
 namespace webrtc {
diff --git a/api/test/fake_frame_encryptor.h b/api/test/fake_frame_encryptor.h
index 0bec967..47597ee 100644
--- a/api/test/fake_frame_encryptor.h
+++ b/api/test/fake_frame_encryptor.h
@@ -11,7 +11,12 @@
 #ifndef API_TEST_FAKE_FRAME_ENCRYPTOR_H_
 #define API_TEST_FAKE_FRAME_ENCRYPTOR_H_
 
+#include <stddef.h>
+#include <stdint.h>
+
+#include "api/array_view.h"
 #include "api/crypto/frameencryptorinterface.h"
+#include "api/mediatypes.h"
 #include "rtc_base/refcountedobject.h"
 
 namespace webrtc {
diff --git a/api/test/test_dependency_factory.cc b/api/test/test_dependency_factory.cc
index 179c623..3b80662 100644
--- a/api/test/test_dependency_factory.cc
+++ b/api/test/test_dependency_factory.cc
@@ -13,6 +13,7 @@
 
 #include "absl/memory/memory.h"
 #include "api/test/test_dependency_factory.h"
+#include "rtc_base/checks.h"
 #include "rtc_base/thread_checker.h"
 
 namespace webrtc {
diff --git a/api/test/test_dependency_factory.h b/api/test/test_dependency_factory.h
index ac2dd70..29f00b8 100644
--- a/api/test/test_dependency_factory.h
+++ b/api/test/test_dependency_factory.h
@@ -14,7 +14,6 @@
 #include <memory>
 
 #include "api/test/video_quality_test_fixture.h"
-#include "rtc_base/thread_checker.h"
 
 namespace webrtc {
 
diff --git a/api/test/videocodec_test_stats.h b/api/test/videocodec_test_stats.h
index b6957b8..5de015f 100644
--- a/api/test/videocodec_test_stats.h
+++ b/api/test/videocodec_test_stats.h
@@ -11,7 +11,8 @@
 #ifndef API_TEST_VIDEOCODEC_TEST_STATS_H_
 #define API_TEST_VIDEOCODEC_TEST_STATS_H_
 
-#include <map>
+#include <stddef.h>
+#include <stdint.h>
 #include <string>
 #include <vector>