Roll chromium_revision 3b7968d..b77e5bb (359482:359767)

Change log: https://chromium.googlesource.com/chromium/src/+log/3b7968d..b77e5bb
Full diff: https://chromium.googlesource.com/chromium/src/+/3b7968d..b77e5bb

Changed dependencies:
* src/tools/gyp: https://chromium.googlesource.com/external/gyp.git/+log/2c1e6cc..33b351b
DEPS diff: https://chromium.googlesource.com/chromium/src/+/3b7968d..b77e5bb/DEPS

No update to Clang.

TBR=
CQ_EXTRA_TRYBOTS=tryserver.webrtc:win_baremetal,mac_baremetal,linux_baremetal

Review URL: https://codereview.webrtc.org/1449783002

Cr-Commit-Position: refs/heads/master@{#10642}
diff --git a/DEPS b/DEPS
index 39effeb..0a8745b 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': '3b7968d886f0ed06a7bddbcde0639e9238052416',
+  'chromium_revision': 'b77e5bbb09cacac678ca2b1f36a4280d65519cd6',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than