Roll chromium_revision b7ebd042d1..551bb334c0 (390693:390850)

Change log: https://chromium.googlesource.com/chromium/src/+log/b7ebd042d1..551bb334c0
Full diff: https://chromium.googlesource.com/chromium/src/+/b7ebd042d1..551bb334c0

Changed dependencies:
* src/third_party/libFuzzer/src: https://chromium.googlesource.com/chromium/llvm-project/llvm/lib/Fuzzer.git/+log/84041ac212..badcec68b8
* src/third_party/libvpx/source/libvpx: https://chromium.googlesource.com/webm/libvpx.git/+log/83f17eeede..b2ccb9c189
DEPS diff: https://chromium.googlesource.com/chromium/src/+/b7ebd042d1..551bb334c0/DEPS

No update to Clang.

TBR=marpan@webrtc.org, stefan@webrtc.org,

Review-Url: https://codereview.webrtc.org/1938773002
Cr-Commit-Position: refs/heads/master@{#12578}
diff --git a/DEPS b/DEPS
index b286ea7..087e183 100644
--- a/DEPS
+++ b/DEPS
@@ -6,7 +6,7 @@
 vars = {
   'extra_gyp_flag': '-Dextra_gyp_flag=0',
   'chromium_git': 'https://chromium.googlesource.com',
-  'chromium_revision': 'b7ebd042d13e4fdc1d6466846baf5cc431b2a557',
+  'chromium_revision': '551bb334c03f5aea2d0b6b260b5129e5e9ded2fb',
 }
 
 # NOTE: Use http rather than https; the latter can cause problems for users