Cleaning up src/media to be consistent with static versus anonymous namespaces.

media/filters/file_data_source_unittest.cc

Index: media/filters/file_data_source_unittest.cc
diff --git a/media/filters/file_data_source_unittest.cc b/media/filters/file_data_source_unittest.cc
index 8e867be0010a04229266b4270efb7122a89b8a4b..1770ac4e7dff49a24ef5f50cc2d1d1bd93e004d2 100644
--- a/media/filters/file_data_source_unittest.cc
+++ b/media/filters/file_data_source_unittest.cc
@@ -16,7 +16,7 @@
 using ::testing::NiceMock;
 using ::testing::StrictMock;
 
-namespace {
+namespace media {
 
 class ReadCallbackHandler {
  public:
@@ -28,10 +28,6 @@ class ReadCallbackHandler {
   DISALLOW_COPY_AND_ASSIGN(ReadCallbackHandler);
 };
 
-}  // namespace
-
-namespace media {
-
 // Returns a path to the test file which contains the string "0123456789"
 // without the quotes or any trailing space or null termination.  The file lives
 // under the media/test/data directory.  Under Windows, strings for the