Reduce warnings.

lib/http/cookie.rb

@@ -391,16 +391,16 @@ class HTTP::Cookie
     if (HTTP::Cookie.normalize_path(origin) + './').path != @path
       string << "; path=#{@path}"
     end
-    if expires = @expires
+    if @expires
       string << "; expires=#{@expires.httpdate}"
     end
-    if comment = @comment
+    if @comment
       string << "; comment=#{@comment}"
     end
-    if httponly?
+    if @httponly
       string << "; HttpOnly"
     end
-    if secure?
+    if @secure
       string << "; secure"
     end
     string

lib/http/cookie_jar/abstract_saver.rb

@@ -1,5 +1,3 @@
-require 'http/cookie_jar'
-
 class HTTP::CookieJar::AbstractSaver
   class << self
     @@class_map = {}
@@ -13,7 +11,7 @@ class HTTP::CookieJar::AbstractSaver
       begin
         require 'http/cookie_jar/%s_saver' % symbol
         @@class_map.fetch(symbol)
-      rescue LoadError, IndexError => e
+      rescue LoadError, IndexError
         raise IndexError, 'cookie saver unavailable: %s' % symbol.inspect
       end
     end

lib/http/cookie_jar/abstract_store.rb

@@ -1,5 +1,3 @@
-require 'http/cookie_jar'
-
 class HTTP::CookieJar::AbstractStore
   class << self
     @@class_map = {}
@@ -13,7 +11,7 @@ class HTTP::CookieJar::AbstractStore
       begin
         require 'http/cookie_jar/%s_store' % symbol
         @@class_map.fetch(symbol)
-      rescue LoadError, IndexError => e
+      rescue LoadError, IndexError
         raise IndexError, 'cookie store unavailable: %s' % symbol.inspect
       end
     end