Upstream iOS FeatureDefines
<http://webkit.org/b/108753>

Reviewed by Anders Carlsson.

Source/JavaScriptCore:

* Configurations/FeatureDefines.xcconfig:
- ENABLE_DEVICE_ORIENTATION: Add iOS configurations.
- ENABLE_PLUGIN_PROXY_FOR_VIDEO: Ditto.
- FEATURE_DEFINES: Add ENABLE_PLUGIN_PROXY_FOR_VIDEO.  Add
  PLATFORM_NAME variant to reduce future merge conflicts.

Source/WebCore:

* Configurations/FeatureDefines.xcconfig:
- ENABLE_DEVICE_ORIENTATION: Add iOS configurations.
- ENABLE_PLUGIN_PROXY_FOR_VIDEO: Ditto.
- FEATURE_DEFINES: Add ENABLE_PLUGIN_PROXY_FOR_VIDEO.  Add
  PLATFORM_NAME variant to reduce future merge conflicts.

Source/WebKit/mac:

* Configurations/FeatureDefines.xcconfig:
- ENABLE_DEVICE_ORIENTATION: Add iOS configurations.
- ENABLE_PLUGIN_PROXY_FOR_VIDEO: Ditto.
- FEATURE_DEFINES: Add ENABLE_PLUGIN_PROXY_FOR_VIDEO.  Add
  PLATFORM_NAME variant to reduce future merge conflicts.

Source/WebKit2:

* Configurations/FeatureDefines.xcconfig:
- ENABLE_DEVICE_ORIENTATION: Add iOS configurations.
- ENABLE_PLUGIN_PROXY_FOR_VIDEO: Ditto.
- FEATURE_DEFINES: Add ENABLE_PLUGIN_PROXY_FOR_VIDEO.  Add
  PLATFORM_NAME variant to reduce future merge conflicts.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141699 268f45cc-cd09-0410-ab3c-d52691b4dbfc