Remove obsolete entries from .gitignore.

.gitignore

 *.gypcmd
 *.mk
 *.ncb
 *.opensdf
 *.orig
 *.props
 *.pyc
 *.rules
 *.sdf
 *.sln
@@ skipping 313 matching lines @@
 /third_party/jsoncpp/source
 /third_party/jsr-305/src
 /third_party/junit/src
 /third_party/kasko
 /third_party/khronos_glcts
 /third_party/leveldatabase/src
 /third_party/leveldb
 /third_party/libaddressinput/src
 /third_party/libexif/sources
 /third_party/libjingle/source
-/third_party/libjingle/source_internal
 /third_party/libjpeg_turbo
 /third_party/liblouis/src
 /third_party/libphonenumber/libphonenumber.xml
 /third_party/libphonenumber/libphonenumber_without_metadata.xml
 /third_party/libphonenumber/src
 /third_party/libsrtp
 /third_party/libvpx
 /third_party/libvpx_new/source/libvpx
 /third_party/libwebm/source
 /third_party/libyuv
@@ skipping 50 matching lines @@
 /third_party/v8-i18n
 /third_party/valgrind
 /third_party/v4l2capture
 /third_party/webdriver/pylib
 /third_party/webdriver/python/selenium
 /third_party/webgl
 /third_party/webgl/src
 /third_party/WebKit
 /third_party/webpagereplay/
 /third_party/webrtc
-/third_party/webrtc/internal
-/third_party/webrtc/modules/video_coding/codecs/vp8_internal
 /third_party/widevine/cdm/chromeos
 /third_party/widevine/cdm/linux
 /third_party/widevine/cdm/mac
 /third_party/widevine/cdm/win
 /third_party/widevine/test/license_server
 /third_party/win_toolchain/.timestamps
 /third_party/win_toolchain/files
 /third_party/wix
 /third_party/xdg-utils
 /third_party/xulrunner-sdk
@@ skipping 24 matching lines @@
 /ui/surface/surface.xml
 /ui/surface/surface_gpu_tests.xml
 /v8
 # Results directory for run-webkit-tests. http://crbug.com/488288
 /webkit
 /webpagereplay_logs/
 /win8/delegate_execute/delegate_execute_version_resources.xml
 /win8/metro_driver/metro_driver_version_resources.xml
 /x86-generic_out/
 /xcodebuild