Remove trailing "/" from DEPS to fix checkdeps.py.

TBR=harringtond@chromium.org

Bug: 1115137
Change-Id: I212b3279f81948a0964de8985d8c9ccea1fa4e0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354416Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Dan H <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797723}

chrome/android/feed/DEPS

@@ -8,6 +8,6 @@ include_rules = [
   "+components/feature_engagement",
   "+components/feed",
 
-  "-content/",
+  "-content",
   "+content/public/android/java/src/org/chromium/content_public",
 ]