Revert of Remove MockConstraints

components/test_runner/mock_web_user_media_client.cc

Index: components/test_runner/mock_web_user_media_client.cc
diff --git a/components/test_runner/mock_web_user_media_client.cc b/components/test_runner/mock_web_user_media_client.cc
index a5f8bdcbe76c7fdb72b5835db62261d0f31376fe..4197a268e105f418bf8698d1ac58a536989f57ca 100644
--- a/components/test_runner/mock_web_user_media_client.cc
+++ b/components/test_runner/mock_web_user_media_client.cc
@@ -8,6 +8,7 @@
 
 #include "base/logging.h"
 #include "base/macros.h"
+#include "components/test_runner/mock_constraints.h"
 #include "components/test_runner/web_test_delegate.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
 #include "third_party/WebKit/public/platform/WebMediaDeviceInfo.h"
@@ -145,6 +146,22 @@
         return;
     }
 
+    WebMediaConstraints constraints = request.audioConstraints();
+    WebString failed_constraint;
+    if (!constraints.isNull() &&
+        !MockConstraints::VerifyConstraints(constraints, &failed_constraint)) {
+      delegate_->PostTask(new UserMediaRequestConstraintFailedTask(
+          this, request, failed_constraint));
+      return;
+    }
+    constraints = request.videoConstraints();
+    if (!constraints.isNull() &&
+        !MockConstraints::VerifyConstraints(constraints, &failed_constraint)) {
+      delegate_->PostTask(new UserMediaRequestConstraintFailedTask(
+          this, request, failed_constraint));
+      return;
+    }
+
     WebMediaStream stream;
     stream.initialize(WebVector<WebMediaStreamTrack>(),
                       WebVector<WebMediaStreamTrack>());