Roll chromium_revision 5482f56..310ea93 (347609:349094)

The WebKit dependency could be removed again after
https://codereview.chromium.org/1338193003/

Relevant changes:
* src/buildtools: 565d04e..f7310ee
* src/third_party/boringssl/src: ac8302a..1d128f3
* src/third_party/libvpx: 0304cef..ac1772e
* src/third_party/libyuv: 0bc626a..fcacbfb
* src/third_party/mockito/src: ed99a52..4d987dc
* src/tools/swarming_client: 2866a22..77f720b
Details: 5482f56..310ea93/DEPS

Clang version was not updated in this roll.

TBR=marpan@webrtc.org

Review URL: https://codereview.webrtc.org/1347153003 .

Cr-Commit-Position: refs/heads/master@{#9962}

setup_links.py

@@ -62,7 +62,6 @@ DIRECTORIES = [
   'third_party/sqlite',
   'third_party/syzygy',
   'third_party/usrsctp',
-  'third_party/WebKit',
   'third_party/yasm',
   'third_party/zlib',
   'tools/clang',