https://bugs.webkit.org/show_bug.cgi?id=111890

Reviewed by Eric Seidel.

Source/WebCore:

Our experience with the Chromium port is that these legacy CSS vendor
prefixes (-apple- and -khtml-) are not needed for web compatibility.
There is reason to believe, however, that they are needed for
compatibility with Mac OS X Dashboard widgets.

This patch makes the code for these legacy CSS vendor prefixes
enabled at runtime and only enables them when running in Dashboard
compatibility mode. This is the first step towards the plan outlined in
https://lists.webkit.org/pipermail/webkit-dev/2013-March/024085.html.

This patch also removes support for ENABLE(LEGACY_CSS_VENDOR_PREFIXES)
from the V8 bindings because V8 is never used with Dashboard.

* bindings/generic/RuntimeEnabledFeatures.cpp:
(WebCore):
* bindings/generic/RuntimeEnabledFeatures.h:
(RuntimeEnabledFeatures):
(WebCore::RuntimeEnabledFeatures::setLegacyCSSVendorPrefixesEnabled):
(WebCore::RuntimeEnabledFeatures::legacyCSSVendorPrefixesEnabled):
* bindings/js/JSCSSStyleDeclarationCustom.cpp:
(WebCore::getCSSPropertyNamePrefix):
(WebCore::cssPropertyIDForJSCSSPropertyName):
* bindings/v8/custom/V8CSSStyleDeclarationCustom.cpp:
(WebCore::cssPropertyInfo):
* css/CSSParser.cpp:
(WebCore::CSSParser::rewriteSpecifiers):

Source/WebKit/mac:

Enable legacy CSS vendor prefixes when we've been asked to turn on
Dashboard compatibility mode.

* WebView/WebView.mm:
(-[WebView _setDashboardBehavior:to:]):

LayoutTests:

* inspector/styles/vendor-prefixes-expected.txt:
    - Update results to show our new behavior now that -apple- and
      -khtml- are not supported.
* platform/mac/TestExpectations:
    - Skip a test that is testing that we support -apple- prefixes.
* platform/mac/fast/css/dashboard-region-parser.html:
    - Update test to use -webkit- rather than -apple-.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146025 268f45cc-cd09-0410-ab3c-d52691b4dbfc