macosx: set window delegate for messages panel, remove singleton

extras/package/macosx/Resources/English.lproj/DebugMessageVisualizer.xib

@@ -2,7 +2,7 @@
 <archive type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="8.00">
 	<data>
 		<int key="IBDocument.SystemTarget">1060</int>
-		<string key="IBDocument.SystemVersion">14F6a</string>
+		<string key="IBDocument.SystemVersion">14F25a</string>
 		<string key="IBDocument.InterfaceBuilderVersion">7706</string>
 		<string key="IBDocument.AppKitVersion">1348.17</string>
 		<string key="IBDocument.HIToolboxVersion">758.70</string>
@@ -323,6 +323,14 @@
 					</object>
 					<int key="connectionID">24</int>
 				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBOutletConnection" key="connection">
+						<string key="label">delegate</string>
+						<reference key="source" ref="401114513"/>
+						<reference key="destination" ref="1001"/>
+					</object>
+					<int key="connectionID">25</int>
+				</object>
 				<object class="IBConnectionRecord">
 					<object class="IBOutletConnection" key="connection">
 						<string key="label">dataSource</string>
@@ -476,7 +484,7 @@
 			<nil key="activeLocalization"/>
 			<dictionary class="NSMutableDictionary" key="localizations"/>
 			<nil key="sourceID"/>
-			<int key="maxID">24</int>
+			<int key="maxID">25</int>
 		</object>
 		<object class="IBClassDescriber" key="IBDocument.Classes">
 			<array class="NSMutableArray" key="referencedPartialClassDescriptions">

modules/gui/macosx/DebugMessageVisualizer.h

@@ -31,7 +31,6 @@
     IBOutlet NSButton * _msgs_refresh_btn;
     IBOutlet id _msgs_table;
 }
-+ (VLCDebugMessageVisualizer *)sharedInstance;
 
 - (void)showWindow:(id)sender;
 

modules/gui/macosx/DebugMessageVisualizer.m

@@ -67,18 +67,6 @@ static void MsgCallback(void *data, int type, const vlc_log_t *item, const char
 
 @implementation VLCDebugMessageVisualizer
 
-+ (VLCDebugMessageVisualizer *)sharedInstance
-{
-    static VLCDebugMessageVisualizer *sharedInstance = nil;
-    static dispatch_once_t pred;
-
-    dispatch_once(&pred, ^{
-        sharedInstance = [VLCDebugMessageVisualizer new];
-    });
-
-    return sharedInstance;
-}
-
 - (id)init
 {
     self = [super initWithWindowNibName:@"DebugMessageVisualizer"];