Move EndsWith to base namespace.

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Review URL: https://codereview.chromium.org/1182183003

Cr-Commit-Position: refs/heads/master@{#334284}
diff --git a/components/variations/net/variations_http_header_provider.cc b/components/variations/net/variations_http_header_provider.cc
index fae7c955..00aa5d6 100644
--- a/components/variations/net/variations_http_header_provider.cc
+++ b/components/variations/net/variations_http_header_provider.cc
@@ -280,7 +280,7 @@
   // is very straight forward.
   const std::string host = url.host();
   for (size_t i = 0; i < arraysize(kSuffixesToSetHeadersFor); ++i) {
-    if (EndsWith(host, kSuffixesToSetHeadersFor[i], false))
+    if (base::EndsWith(host, kSuffixesToSetHeadersFor[i], false))
       return true;
   }