linux: Implement the new AutoFill section of the Options dialog.

chrome/app/nibs/Preferences.xib

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                 <string key="IBDocument.SystemVersion">9L31a</string>
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                 <string key="IBDocument.HIToolboxVersion">353.00</string>
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                         <bool key="EncodedWithXMLCoder">YES</bool>
@@ skipping 2071 matching lines @@
                                                 <string key="NSFrame">{{152, 150}, {358, 38}}</string>
                                                 <reference key="NSSuperview" ref="393583039"/>
                                                 <bool key="NSEnabled">YES</bool>
                                                 <int key="NSNumRows">2</int>
                                                 <int key="NSNumCols">1</int>
                                                 <object class="NSMutableArray" key="NSCells">
                                                         <bool key="EncodedWithXMLCoder">YES</bool>
                                                         <object class="NSButtonCell" id="674682819">
                                                                 <int key="NSCellFlags">-2080244224</int>
                                                                 <int key="NSCellFlags2">0</int>
-                                                                <string key="NSContents">^IDS_OPTIONS_AUTOFILL_SAVE</string>
+                                                                <string key="NSContents">^IDS_OPTIONS_AUTOFILL_ENABLE</string>
                                                                 <reference key="NSSupport" ref="445696277"/>
                                                                 <int key="NSTag">1</int>
                                                                 <reference key="NSControlView" ref="854747859"/>
                                                                 <int key="NSButtonFlags">1211912703</int>
                                                                 <int key="NSButtonFlags2">128</int>
                                                                 <reference key="NSAlternateImage" ref="1028460734"/>
                                                                 <string key="NSAlternateContents"/>
                                                                 <string key="NSKeyEquivalent"/>
                                                                 <int key="NSPeriodicDelay">200</int>
                                                                 <int key="NSPeriodicInterval">25</int>
                                                         </object>
                                                         <object class="NSButtonCell" id="201008548">
                                                                 <int key="NSCellFlags">67239424</int>
                                                                 <int key="NSCellFlags2">0</int>
-                                                                <string key="NSContents">^IDS_OPTIONS_AUTOFILL_NEVERSAVE</string>
+                                                                <string key="NSContents">^IDS_OPTIONS_AUTOFILL_DISABLE</string>
                                                                 <reference key="NSSupport" ref="445696277"/>
                                                                 <reference key="NSControlView" ref="854747859"/>
                                                                 <int key="NSButtonFlags">1211912703</int>
                                                                 <int key="NSButtonFlags2">128</int>
                                                                 <object class="NSImage" key="NSNormalImage">
                                                                         <int key="NSImageFlags">549453824</int>
                                                                         <string key="NSSize">{18, 18}</string>
                                                                         <object class="NSMutableArray" key="NSReps">
                                                                                 <bool key="EncodedWithXMLCoder">YES</bool>
                                                                                 <object class="NSArray">
@@ skipping 3389 matching lines @@
                                                 <string key="minorKey">browser/cocoa/preferences_window_controller.h</string>
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                                 </object>
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                 <int key="IBDocument.localizationMode">0</int>
                 <string key="IBDocument.LastKnownRelativeProjectPath">../../chrome.xcodeproj</string>
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