Mac: make save/open dialogs operate as tab-modal sheets....

chrome/app/nibs/TabContents.xib

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                                         <string>93.ImportedFromIB2</string>
                                         <string>93.windowTemplate.hasMinSize</string>
                                         <string>93.windowTemplate.minSize</string>
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                                         <string>com.apple.InterfaceBuilder.CocoaPlugin</string>
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@@ skipping 22 matching lines @@
                                         <object class="NSMutableDictionary" key="actions">
                                                 <string key="NS.key.0">commandDispatch:</string>
                                                 <string key="NS.object.0">id</string>
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                                                 <string key="majorKey">IBUserSource</string>
                                                 <string key="minorKey"/>
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                                 <object class="IBPartialClassDescription">
-                                        <string key="className">GrowBoxView</string>
-                                        <string key="superclassName">NSView</string>
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                                         <object class="IBClassDescriptionSource" key="sourceIdentifier">
                                                 <string key="majorKey">IBProjectSource</string>
-                                                <string key="minorKey">browser/cocoa/grow_box_view.h</string>
+                                                <string key="minorKey">browser/cocoa/status_bubble_mac.h</string>
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                                 <object class="IBPartialClassDescription">
                                         <string key="className">TabContentsController</string>
                                         <string key="superclassName">NSViewController</string>
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                                         <object class="NSMutableDictionary" key="outlets">
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-                                                        <string>NSBox</string>
-                                                        <string>GrowBoxView</string>
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+                                                <string key="NS.object.0">NSBox</string>
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                                         <object class="IBClassDescriptionSource" key="sourceIdentifier">
                                                 <string key="majorKey">IBProjectSource</string>
                                                 <string key="minorKey">browser/cocoa/tab_contents_controller.h</string>
                                         </object>
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+                                <object class="IBPartialClassDescription">
+                                        <string key="className">TabContentsControllerView</string>
+                                        <string key="superclassName">NSView</string>
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                 <int key="IBDocument.localizationMode">0</int>
-                <string key="IBDocument.LastKnownRelativeProjectPath">../../../chrome.xcodeproj</string>
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