chore: remove redundant 10.11 @avilable checks (#31184)

shell/browser/mac/electron_application.mm

@@ -99,10 +99,8 @@ inline void dispatch_sync_main(dispatch_block_t block) {
 }
 
 - (void)resignCurrentActivity {
-  if (@available(macOS 10.11, *)) {
   if (currentActivity_)
     [currentActivity_ resignCurrent];
-  }
 }
 
 - (void)updateCurrentActivity:(NSString*)type

shell/browser/native_window_mac.mm

@@ -1408,7 +1408,6 @@ void NativeWindowMac::SetVibrancy(const std::string& type) {
     vibrancyType = NSVisualEffectMaterialTitlebar;
   }
 
-  if (@available(macOS 10.11, *)) {
   if (type == "selection") {
     vibrancyType = NSVisualEffectMaterialSelection;
   } else if (type == "menu") {
@@ -1422,11 +1421,9 @@ void NativeWindowMac::SetVibrancy(const std::string& type) {
                 "electron");
     vibrancyType = NSVisualEffectMaterialMediumLight;
   } else if (type == "ultra-dark") {
-      EmitWarning(env, "NSVisualEffectMaterialUltraDark" + dep_warn,
-                  "electron");
+    EmitWarning(env, "NSVisualEffectMaterialUltraDark" + dep_warn, "electron");
     vibrancyType = NSVisualEffectMaterialUltraDark;
   }
-  }
 
   if (@available(macOS 10.14, *)) {
     if (type == "header") {

shell/browser/ui/tray_icon_cocoa.mm

@@ -125,17 +125,14 @@
                   range:NSMakeRange(0, [attributed_title length])];
     }
   } else if ([font_type isEqualToString:@"monospacedDigit"]) {
-    if (@available(macOS 10.11, *)) {
     NSDictionary* attributes = @{
       NSFontAttributeName :
           [NSFont monospacedDigitSystemFontOfSize:existing_size
                                            weight:NSFontWeightRegular]
     };
-      [attributed_title
-          addAttributes:attributes
+    [attributed_title addAttributes:attributes
                               range:NSMakeRange(0, [attributed_title length])];
   }
-  }
 
   // Set title
   [[statusItem_ button] setAttributedTitle:attributed_title];