Enforce different min size for popups than tabbed browsers on MacOSX.

chrome/app/nibs/BrowserWindow.xib

 <?xml version="1.0" encoding="UTF-8"?>
 <archive type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="7.10">
         <data>
                 <int key="IBDocument.SystemTarget">1050</int>
                 <string key="IBDocument.SystemVersion">10J869</string>
                 <string key="IBDocument.InterfaceBuilderVersion">851</string>
                 <string key="IBDocument.AppKitVersion">1038.35</string>
                 <string key="IBDocument.HIToolboxVersion">461.00</string>
                 <object class="NSMutableDictionary" key="IBDocument.PluginVersions">
                         <string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin</string>
@@ skipping 30 matching lines @@
                         </object>
                         <object class="NSWindowTemplate" id="1005">
                                 <int key="NSWindowStyleMask">4367</int>
                                 <int key="NSWindowBacking">2</int>
                                 <string key="NSWindowRect">{{60, 229}, {750, 600}}</string>
                                 <int key="NSWTFlags">536872960</int>
                                 <string key="NSWindowTitle"/>
                                 <string key="NSWindowClass">FramedBrowserWindow</string>
                                 <nil key="NSViewClass"/>
                                 <string key="NSWindowContentMaxSize">{1.79769e+308, 1.79769e+308}</string>
-                                <string key="NSWindowContentMinSize">{400, 250}</string>
                                 <object class="NSView" key="NSWindowView" id="1006">
                                         <reference key="NSNextResponder"/>
                                         <int key="NSvFlags">256</int>
                                         <object class="NSMutableArray" key="NSSubviews">
                                                 <bool key="EncodedWithXMLCoder">YES</bool>
                                                 <object class="NSCustomView" id="1858870">
                                                         <reference key="NSNextResponder" ref="1006"/>
                                                         <int key="NSvFlags">274</int>
                                                         <string key="NSFrameSize">{750, 600}</string>
                                                         <reference key="NSSuperview" ref="1006"/>
                                                         <reference key="NSWindow"/>
                                                         <string key="NSClassName">FastResizeView</string>
                                                 </object>
                                         </object>
                                         <string key="NSFrameSize">{750, 600}</string>
                                         <reference key="NSSuperview"/>
                                         <reference key="NSWindow"/>
                                 </object>
                                 <string key="NSScreenRect">{{0, 0}, {1440, 878}}</string>
-                                <string key="NSMinSize">{400, 272}</string>
                                 <string key="NSMaxSize">{1.79769e+308, 1.79769e+308}</string>
                         </object>
                         <object class="NSCustomView" id="1029219716">
                                 <reference key="NSNextResponder"/>
                                 <int key="NSvFlags">266</int>
                                 <object class="NSMutableArray" key="NSSubviews">
                                         <bool key="EncodedWithXMLCoder">YES</bool>
                                         <object class="NSButton" id="1069275088">
                                                 <reference key="NSNextResponder" ref="1029219716"/>
                                                 <int key="NSvFlags">-2147483383</int>
@@ skipping 1295 matching lines @@
                 </object>
                 <object class="NSMutableDictionary" key="IBDocument.PluginDeclaredDevelopmentDependencies">
                         <string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin.InterfaceBuilder3</string>
                         <integer value="3000" key="NS.object.0"/>
                 </object>
                 <bool key="IBDocument.PluginDeclaredDependenciesTrackSystemTargetVersion">YES</bool>
                 <string key="IBDocument.LastKnownRelativeProjectPath">../../chrome.xcodeproj</string>
                 <int key="IBDocument.defaultPropertyAccessControl">3</int>
         </data>
 </archive>