[Cleanup] Fix a typo.

R=asvitkine@chromium.org

Bug: none
Change-Id: I392d54d332cd0ec4d43fa3afbfcc8317a1eac165
Reviewed-on: https://chromium-review.googlesource.com/812479
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522423}

components/variations/client_filterable_state.h

@@ -14,7 +14,7 @@
 
 namespace variations {
 
-// A contianer for all of the client state which is used for filtering studies.
+// A container for all of the client state which is used for filtering studies.
 struct ClientFilterableState {
   static Study::Platform GetCurrentPlatform();