Handle keyboard shortcuts in Mac Panels.

chrome/app/nibs/Panel.xib

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                         <string key="NS.object.0">804</string>
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                 <object class="NSMutableArray" key="IBDocument.EditedObjectIDs">
                         <bool key="EncodedWithXMLCoder">YES</bool>
+                        <integer value="1"/>
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@@ skipping 11 matching lines @@
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                                 <string key="NSWindowRect">{{196, 240}, {480, 270}}</string>
                                 <int key="NSWTFlags">544736256</int>
                                 <string key="NSWindowTitle">Window</string>
-                                <string key="NSWindowClass">NSWindow</string>
+                                <string key="NSWindowClass">ChromeEventProcessingWindow</string>
                                 <nil key="NSViewClass"/>
                                 <string key="NSWindowContentMaxSize">{1.79769e+308, 1.79769e+308}</string>
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                                         <reference key="NSNextResponder"/>
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@@ skipping 139 matching lines @@
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                         <object class="NSMutableArray" key="referencedPartialClassDescriptions">
                                 <bool key="EncodedWithXMLCoder">YES</bool>
                                 <object class="IBPartialClassDescription">
+                                        <string key="className">ChromeEventProcessingWindow</string>
+                                        <string key="superclassName">NSWindow</string>
+                                        <object class="IBClassDescriptionSource" key="sourceIdentifier">
+                                                <string key="majorKey">IBUserSource</string>
+                                                <string key="minorKey"/>
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                                         <string key="className">FirstResponder</string>
                                         <string key="superclassName">NSObject</string>
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                                                 <string key="NS.key.0">commandDispatch:</string>
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                                                 <string key="NS.key.0">commandDispatch:</string>
                                                 <object class="IBActionInfo" key="NS.object.0">
                                                         <string key="name">commandDispatch:</string>
@@ skipping 757 matching lines @@
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                         <string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin.InterfaceBuilder3</string>
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