extensions: Use stl utilities from the base namespace

extensions/browser/api/declarative_webrequest/webrequest_condition.cc

Index: extensions/browser/api/declarative_webrequest/webrequest_condition.cc
diff --git a/extensions/browser/api/declarative_webrequest/webrequest_condition.cc b/extensions/browser/api/declarative_webrequest/webrequest_condition.cc
index 7e41f1228ece01b3c3ee8573b9fc0b4f6f0fc621..aacc29a4aa847120f1a9109f7562cd53569df21b 100644
--- a/extensions/browser/api/declarative_webrequest/webrequest_condition.cc
+++ b/extensions/browser/api/declarative_webrequest/webrequest_condition.cc
@@ -99,12 +99,15 @@ bool WebRequestCondition::IsFulfilled(
 
   // Check URL attributes if present.
   if (url_matcher_conditions_.get() &&
-      !ContainsKey(request_data.url_match_ids, url_matcher_conditions_->id()))
+      !base::ContainsKey(request_data.url_match_ids,
+                         url_matcher_conditions_->id())) {
     return false;
+  }
   if (first_party_url_matcher_conditions_.get() &&
-      !ContainsKey(request_data.first_party_url_match_ids,
-                   first_party_url_matcher_conditions_->id()))
+      !base::ContainsKey(request_data.first_party_url_match_ids,
+                         first_party_url_matcher_conditions_->id())) {
     return false;
+  }

[Finnur, 2016/08/11 10:19:47]

For a long time, we've asked people to not add braces to single line if-blocks
in extensions code, when only the conditional is multi-line.

So, I don't see adding braces as a positive here. 

[Sami, 2016/08/12 12:25:03]

Oh, I thought it was an oversight. Reverted to the previous style.

 
   // All condition attributes must be fulfilled for a fulfilled condition.
   for (WebRequestConditionAttributes::const_iterator i =