fix memory leak

Author: karlseguin

src/browser/browser.zig

@@ -178,7 +178,7 @@ pub const Session = struct {
 
     fn deinit(self: *Session) void {
         if (self.page) |*p| {
-            p.end();
+            p.deinit();
         }
 
         self.env.deinit();
@@ -214,6 +214,10 @@ pub const Session = struct {
         self.page = Page.init(self.allocator, self);
         return &self.page.?;
     }
+
+    pub fn currentPage(self: *Session) ?*Page {
+        return &(self.page orelse return null);
+    }
 };
 
 // Page navigates to an url.

src/cdp/page.zig

@@ -244,7 +244,7 @@ fn navigate(cmd: anytype) !void {
 
     // Launch navigate, the page must have been created by a
     // target.createTarget.
-    var p = cmd.session.page orelse return error.NoPage;
+    var p = cmd.session.currentPage() orelse return error.NoPage;
     state.execution_context_id += 1;
 
     const aux_data = try std.fmt.allocPrint(