Update prebuilt rc binary.

CL created by running build/toolchain/win/rc/upload_rc_binaries.sh
Picks up b78055a9b7

Bug: 814452
Change-Id: Id8d5c8b1bde49e0899314901782a5228212080f8
Reviewed-on: https://chromium-review.googlesource.com/929941
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#538449}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a099dfc3728ae6a737d2a0b716c9609915f200be

toolchain/win/rc/linux64/rc.sha1

@@ -1 +1 @@
-c6f648cc36e963072f6c18e980a69b299512a3ff
+2d0c766039264dc2514d005a42f074af4838a446

toolchain/win/rc/mac/rc.sha1

@@ -1 +1 @@
-15fae6b7960f0614628b14c7f5e3809ff05dd75a
+4c25c3bcb6608109bb52028d008835895cf72629

toolchain/win/rc/win/rc.exe.sha1

@@ -1 +1 @@
-f87131fc898652b637554cf22097a077e13142dc
+ba51d69039ffb88310b72b6568efa9f0de148f8f