media: Migrate before creation callback to repeating closure.

This closure is run as part of a factory method, therefore it can be run
repeatedly:
* https://source.chromium.org/chromium/chromium/src/+/master:media/base/mock_filters.cc;drc=d9b91db0b32bcaed524db17b05f614c7e86326bc;l=232

This is part of the base::Callback migration.

Context: http://doc/1J4N3V5UmzZL9BZGNrn95E4xJu4cz3ynbg21zXR-J_qA#heading=h.uxpxu8vg4k4r

Bug: 1007805
Change-Id: Ied0c7ed6476c29577bf02821a54c71fdf361dd8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111096
Commit-Queue: Jose Lopes <jabolopes@google.com>
Auto-Submit: Jose Lopes <jabolopes@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755890}

media/base/mock_filters.cc

@@ -247,8 +247,8 @@ MockCdm* MockCdmFactory::GetCreatedCdm() {
 }
 
 void MockCdmFactory::SetBeforeCreationCB(
-    const base::Closure& before_creation_cb) {
-  before_creation_cb_ = before_creation_cb;
+    base::RepeatingClosure before_creation_cb) {
+  before_creation_cb_ = std::move(before_creation_cb);
 }
 
 MockStreamParser::MockStreamParser() = default;

media/base/mock_filters.h

@@ -650,14 +650,14 @@ class MockCdmFactory : public CdmFactory {
   MockCdm* GetCreatedCdm();
 
   // Provide a callback to be called before the CDM is created and returned.
-  void SetBeforeCreationCB(const base::Closure& before_creation_cb);
+  void SetBeforeCreationCB(base::RepeatingClosure before_creation_cb);
 
  private:
   // Reference to the created CDM.
   scoped_refptr<MockCdm> created_cdm_;
 
   // Callback to be used before Create() successfully calls |cdm_created_cb|.
-  base::Closure before_creation_cb_;
+  base::RepeatingClosure before_creation_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(MockCdmFactory);
 };

media/mojo/clients/mojo_cdm_unittest.cc

@@ -92,7 +92,7 @@ class MojoCdmTest : public ::testing::Test {
       if (expected_result == CONNECTION_ERROR_DURING) {
         // Create() will be successful, so provide a callback that will break
         // the connection before returning the CDM.
-        cdm_factory_.SetBeforeCreationCB(base::Bind(
+        cdm_factory_.SetBeforeCreationCB(base::BindRepeating(
             &MojoCdmTest::ForceConnectionError, base::Unretained(this)));
       }
     }