[base] Replace Contains{Key,Value} with Contains in //chrome/browser/extensions

This change replaces usages of base::ContainsKey() and base::ContainsValue()
with base::Contains() in //chrome/browser/extensions.

Reproduction:
 - sed -i 's/\bbase::ContainsKey\b/base::Contains/g'
 - sed -i 's/\bbase::ContainsValue\b/base::Contains/g'
 - git cl format

This CL was uploaded by git cl split.

[email protected], [email protected]

Bug: 970209
Change-Id: I28d4610192d74393f6ccf8e8d5707ecb6cb8000d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648246
Auto-Submit: Jan Wilken Dörrie <[email protected]>
Reviewed-by: Karan Bhatia <[email protected]>
Commit-Queue: Karan Bhatia <[email protected]>
Cr-Commit-Position: refs/heads/master@{#666812}
diff --git a/chrome/browser/extensions/process_manager_browsertest.cc b/chrome/browser/extensions/process_manager_browsertest.cc
index cd2a23d5..a9297d86 100644
--- a/chrome/browser/extensions/process_manager_browsertest.cc
+++ b/chrome/browser/extensions/process_manager_browsertest.cc
@@ -178,7 +178,7 @@
     web_contents()->ForEachFrame(
         base::BindRepeating(&AddFrameToSet, base::Unretained(&current_frames)));
     for (content::RenderFrameHost* frame : frames_) {
-      if (!base::ContainsKey(current_frames, frame))
+      if (!base::Contains(current_frames, frame))
         return false;
     }
     return true;