Replace NULL with nullptr in all C++ files.

webrtc/sdk/android/src/jni/jni_helpers.cc

Index: webrtc/sdk/android/src/jni/jni_helpers.cc
diff --git a/webrtc/sdk/android/src/jni/jni_helpers.cc b/webrtc/sdk/android/src/jni/jni_helpers.cc
index 8860f06d5aeab6ee0fbd405db7df263ee8634ecc..405668f68d2600f79eae9b03d859f752af86922d 100644
--- a/webrtc/sdk/android/src/jni/jni_helpers.cc
+++ b/webrtc/sdk/android/src/jni/jni_helpers.cc
@@ -23,8 +23,8 @@ static JavaVM* g_jvm = nullptr;
 
 static pthread_once_t g_jni_ptr_once = PTHREAD_ONCE_INIT;
 
-// Key for per-thread JNIEnv* data.  Non-NULL in threads attached to |g_jvm| by
-// AttachCurrentThreadIfNeeded(), NULL in unattached threads and threads that
+// Key for per-thread JNIEnv* data.  Non-null in threads attached to |g_jvm| by
+// AttachCurrentThreadIfNeeded(), null in unattached threads and threads that
 // were attached by the JVM because of a Java->native call.
 static pthread_key_t g_jni_ptr;
 
@@ -33,7 +33,7 @@ JavaVM *GetJVM() {
   return g_jvm;
 }
 
-// Return a |JNIEnv*| usable on this thread or NULL if this thread is detached.
+// Return a |JNIEnv*| usable on this thread or null if this thread is detached.
 JNIEnv* GetEnv() {
   void* env = nullptr;
   jint status = g_jvm->GetEnv(&env, JNI_VERSION_1_6);
@@ -44,7 +44,7 @@ JNIEnv* GetEnv() {
 }
 
 static void ThreadDestructor(void* prev_jni_ptr) {
-  // This function only runs on threads where |g_jni_ptr| is non-NULL, meaning
+  // This function only runs on threads where |g_jni_ptr| is non-null, meaning
   // we were responsible for originally attaching the thread, so are responsible
   // for detaching it now.  However, because some JVM implementations (notably
   // Oracle's http://goo.gl/eHApYT) also use the pthread_key_create mechanism,
@@ -69,7 +69,7 @@ static void CreateJNIPtrKey() {
 jint InitGlobalJniVariables(JavaVM *jvm) {
   RTC_CHECK(!g_jvm) << "InitGlobalJniVariables!";
   g_jvm = jvm;
-  RTC_CHECK(g_jvm) << "InitGlobalJniVariables handed NULL?";
+  RTC_CHECK(g_jvm) << "InitGlobalJniVariables handed null?";
 
   RTC_CHECK(!pthread_once(&g_jni_ptr_once, &CreateJNIPtrKey)) << "pthread_once";
 
@@ -82,7 +82,7 @@ jint InitGlobalJniVariables(JavaVM *jvm) {
 
 // Return thread ID as a string.
 static std::string GetThreadId() {
-  char buf[21];  // Big enough to hold a kuint64max plus terminating NULL.
+  char buf[21];  // Big enough to hold a kuint64max plus terminating nullptr.
   RTC_CHECK_LT(snprintf(buf, sizeof(buf), "%ld",
                         static_cast<long>(syscall(__NR_gettid))),
                sizeof(buf))
@@ -119,7 +119,7 @@ JNIEnv* AttachCurrentThreadIfNeeded() {
 #endif
   RTC_CHECK(!g_jvm->AttachCurrentThread(&env, &args))
       << "Failed to attach thread";
-  RTC_CHECK(env) << "AttachCurrentThread handed back NULL!";
+  RTC_CHECK(env) << "AttachCurrentThread handed back null!";
   jni = reinterpret_cast<JNIEnv*>(env);
   RTC_CHECK(!pthread_setspecific(g_jni_ptr, jni)) << "pthread_setspecific";
   return jni;
@@ -180,21 +180,21 @@ jfieldID GetStaticFieldID(JNIEnv* jni,
 jclass GetObjectClass(JNIEnv* jni, jobject object) {
   jclass c = jni->GetObjectClass(object);
   CHECK_EXCEPTION(jni) << "error during GetObjectClass";
-  RTC_CHECK(c) << "GetObjectClass returned NULL";
+  RTC_CHECK(c) << "GetObjectClass returned null";
   return c;
 }
 
 jobject GetObjectField(JNIEnv* jni, jobject object, jfieldID id) {
   jobject o = jni->GetObjectField(object, id);
   CHECK_EXCEPTION(jni) << "error during GetObjectField";
-  RTC_CHECK(!IsNull(jni, o)) << "GetObjectField returned NULL";
+  RTC_CHECK(!IsNull(jni, o)) << "GetObjectField returned null";
   return o;
 }
 
 jobject GetStaticObjectField(JNIEnv* jni, jclass c, jfieldID id) {
   jobject o = jni->GetStaticObjectField(c, id);
   CHECK_EXCEPTION(jni) << "error during GetStaticObjectField";
-  RTC_CHECK(!IsNull(jni, o)) << "GetStaticObjectField returned NULL";
+  RTC_CHECK(!IsNull(jni, o)) << "GetStaticObjectField returned null";
   return o;
 }