Remove CDM_7 support

media/cdm/cdm_adapter.cc

Index: media/cdm/cdm_adapter.cc
diff --git a/media/cdm/cdm_adapter.cc b/media/cdm/cdm_adapter.cc
index 4e40ae89dd849f2a1780c322b455853443c3c10b..1f25a4bcb98fd3a51316a20d823634caab6dc975 100644
--- a/media/cdm/cdm_adapter.cc
+++ b/media/cdm/cdm_adapter.cc
@@ -307,9 +307,8 @@ void* GetCdmHost(int host_interface_version, void* user_data) {
       // Current version is supported.
       IsSupportedCdmHostVersion(cdm::Host_8::kVersion) &&
       // Include all previous supported versions (if any) here.
-      IsSupportedCdmHostVersion(cdm::Host_7::kVersion) &&
       // One older than the oldest supported version is not supported.
-      !IsSupportedCdmHostVersion(cdm::Host_7::kVersion - 1));
+      !IsSupportedCdmHostVersion(cdm::Host_8::kVersion - 1));
   DCHECK(IsSupportedCdmHostVersion(host_interface_version));
 
   CdmAdapter* cdm_adapter = static_cast<CdmAdapter*>(user_data);
@@ -317,8 +316,6 @@ void* GetCdmHost(int host_interface_version, void* user_data) {
   switch (host_interface_version) {
     case cdm::Host_8::kVersion:
       return static_cast<cdm::Host_8*>(cdm_adapter);
-    case cdm::Host_7::kVersion:
-      return static_cast<cdm::Host_7*>(cdm_adapter);
     default:
       NOTREACHED() << "Unexpected host interface version "
                    << host_interface_version;