bump skin version string.

mail/base/content/contents.rdf

@@ -14,7 +14,7 @@
         chrome:author="mozilla.org"
         chrome:name="messenger"
         chrome:localeVersion="1.5a"
-        chrome:skinVersion="1.2">
+        chrome:skinVersion="1.5">
   </RDF:Description>
 
   <!-- overlay information -->

mail/base/content/navigator.rdf

@@ -13,7 +13,7 @@
         chrome:author="mozilla.org"
         chrome:name="navigator"
         chrome:localeVersion="1.5a"
-        chrome:skinVersion="1.2">
+        chrome:skinVersion="1.5">
   </RDF:Description>
 
 </RDF:RDF>

mail/base/skin/contents.rdf

@@ -27,5 +27,5 @@
   <!-- Version Information.  State that we work only with major version 1 of this
        package. -->
   <RDF:Description about="urn:mozilla:skin:classic/1.0:global"
-    chrome:skinVersion="1.2"/>
+    chrome:skinVersion="1.5"/>
 </RDF:RDF>

mail/extensions/offline/content/contents.rdf

@@ -18,7 +18,7 @@
         chrome:extension="true"
         chrome:settingsURL="chrome://messenger-offline/content/pref-offline.xul"
         chrome:localeVersion="1.5a"
-        chrome:skinVersion="1.2">
+        chrome:skinVersion="1.5">
   </RDF:Description>
 
   <!-- overlay information -->