Remove prefixed EME.

content/renderer/renderer_blink_platform_impl.cc

Index: content/renderer/renderer_blink_platform_impl.cc
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 8c2fb0c75f70950e0b45c71a85481657757b65b5..539cecbc5206c78e53ed2e62f64a2bb7f65d7af9 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -78,7 +78,6 @@
 #include "ipc/ipc_sync_message_filter.h"
 #include "media/audio/audio_output_device.h"
 #include "media/base/audio_hardware_config.h"
-#include "media/base/key_systems.h"
 #include "media/base/mime_util.h"
 #include "media/blink/webcontentdecryptionmodule_impl.h"
 #include "media/filters/stream_parser_factory.h"
@@ -192,8 +191,7 @@ class RendererBlinkPlatformImpl::MimeRegistry
  public:
   blink::WebMimeRegistry::SupportsType supportsMediaMIMEType(
       const blink::WebString& mime_type,
-      const blink::WebString& codecs,
-      const blink::WebString& key_system) override;
+      const blink::WebString& codecs) override;
   bool supportsMediaSourceMIMEType(const blink::WebString& mime_type,
                                    const blink::WebString& codecs) override;
   blink::WebString mimeTypeForExtension(
@@ -454,31 +452,9 @@ WebFileSystem* RendererBlinkPlatformImpl::fileSystem() {
 WebMimeRegistry::SupportsType
 RendererBlinkPlatformImpl::MimeRegistry::supportsMediaMIMEType(
     const WebString& mime_type,
-    const WebString& codecs,
-    const WebString& key_system) {
+    const WebString& codecs) {
   const std::string mime_type_ascii = ToASCIIOrEmpty(mime_type);
 
-  if (!key_system.isEmpty()) {
-    // Check whether the key system is supported with the mime_type and codecs.
-
-    // Chromium only supports ASCII parameters.
-    if (!base::IsStringASCII(key_system))
-      return IsNotSupported;
-
-    std::string key_system_ascii =
-        media::GetUnprefixedKeySystemName(base::UTF16ToASCII(
-            base::StringPiece16(key_system)));
-    std::vector<std::string> codec_vector;
-    media::ParseCodecString(ToASCIIOrEmpty(codecs), &codec_vector, true);
-
-    if (!media::PrefixedIsSupportedKeySystemWithMediaMimeType(
-            mime_type_ascii, codec_vector, key_system_ascii)) {
-      return IsNotSupported;
-    }
-
-    // Continue processing the mime_type and codecs.
-  }
-
   std::vector<std::string> codec_vector;
   media::ParseCodecString(ToASCIIOrEmpty(codecs), &codec_vector, false);
   return static_cast<WebMimeRegistry::SupportsType>(