[Fuchsia] Remove redundant widevine_cdm_common.h DEPS

It is already included in the parent DEPS file.

Change-Id: Iaf5d8c59cb50b17a2a4e229c894b8e7c3a07601c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131294
Auto-Submit: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755940}

fuchsia/engine/renderer/DEPS

@@ -5,5 +5,4 @@ include_rules = [
   "+mojo/public/cpp/bindings",
   "+services/service_manager/public/cpp",
   "+third_party/blink/public/common/associated_interfaces",
-  "+third_party/widevine/cdm/widevine_cdm_common.h",
 ]