Remove Mac OS X Leopard (10.5) support
https://bugs.webkit.org/show_bug.cgi?id=107964

Reviewed by Ryosuke Niwa.

Removed the code for 10.5 and removed if-def for 10.6.

Source/WebCore:

No new tests, covered by existing tests.

* platform/LocalizedStrings.cpp:
(WebCore::contextMenuItemTagLookUpInDictionary):
* platform/graphics/cg/GraphicsContextCG.cpp:
* platform/mac/EmptyProtocolDefinitions.h:
* platform/mac/NSScrollerImpDetails.h:
* platform/mac/WebCoreSystemInterface.h:
* platform/text/mac/HyphenationMac.mm:

Source/WebKit/mac:

* DefaultDelegates/WebDefaultContextMenuDelegate.mm:
* Misc/WebKitErrors.m:
(-[NSError _initWithPluginErrorCode:contentURL:pluginPageURL:pluginName:MIMEType:]):
* WebCoreSupport/WebSystemInterface.mm:
(InitWebCoreSystemInterface):
* WebView/WebClipView.mm:
(-[WebClipView _immediateScrollToPoint:]):
* WebView/WebFrameView.mm:
(-[WebFrameView initWithFrame:]):
* WebView/WebView.mm:

Tools:

* DumpRenderTree/cf/WebArchiveDumpSupport.cpp:
(convertMIMEType):
(createXMLStringFromWebArchiveData):
* DumpRenderTree/mac/TestRunnerMac.mm:
(TestRunner::authenticateSession):
(TestRunner::setTextDirection):
* WebKitTestRunner/cf/WebArchiveDumpSupport.cpp:
(convertMIMEType):
(createXMLStringFromWebArchiveData):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149922 268f45cc-cd09-0410-ab3c-d52691b4dbfc