GN: Enable ARC for Mac and iOS in rtc_* templates

webrtc/test/mac/video_renderer_mac.mm

Index: webrtc/test/mac/video_renderer_mac.mm
diff --git a/webrtc/test/mac/video_renderer_mac.mm b/webrtc/test/mac/video_renderer_mac.mm
index f79aecf9161bdb95b97f9a3cf876d58d168b7006..ee1f9060ad37988fbb61af3288fcaf6f829c7bd0 100644
--- a/webrtc/test/mac/video_renderer_mac.mm
+++ b/webrtc/test/mac/video_renderer_mac.mm
@@ -43,11 +43,6 @@
   return self;
 }
 
-- (void)dealloc {
-  [window_ release];
-  [super dealloc];
-}
-
 - (void)createWindow:(NSObject *)ignored {
   NSInteger xOrigin = nextXOrigin_;
   NSRect screenFrame = [[NSScreen mainScreen] frame];
@@ -71,8 +66,8 @@
                                             defer:NO];
 
   NSRect viewFrame = NSMakeRect(0, 0, width_, height_);
-  NSOpenGLView *view = [[[NSOpenGLView alloc] initWithFrame:viewFrame
-                                                pixelFormat:nil] autorelease];
+  NSOpenGLView *view = [[NSOpenGLView alloc] initWithFrame:viewFrame
+                                                pixelFormat:nil];
   context_ = [view openGLContext];
 
   [[window_ contentView] addSubview:view];
@@ -105,7 +100,6 @@ MacRenderer::MacRenderer()
 
 MacRenderer::~MacRenderer() {
   GlRenderer::Destroy();
-  [window_ release];
 }
 
 bool MacRenderer::Init(const char* window_title, int width, int height) {