You can override styles by making the selector more specific.
That should work. In the body element add another class like
<body class='claro myCompany'>
then you can define your own style:
.claro.myCompany .dijitTitlePaneContentOuter {
-moz-border-bottom-colors: none;
-moz-border-image: none;
-moz-border-left-colors: none;
-moz-border-right-colors: none;
-moz-border-top-colors: none;
background: none repeat scroll 0 0 #FFFFFF;
border-color: -moz-use-text-color #B5BCC7 #B5BCC7;
border-width: medium 1px 1px;
}
Something more specific will also work, based on the path of the tree tree, e.g.
<body class='claro'>
<div class='fooClass'>
<your title pane here>
And then in your selector:
.claro.myCompany .fooClass .dijitTitlePaneContentOuter {
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