Removed a few more log prefixes in core/

[ Merge of http://go/wvgerrit/89705 ]

Test: Android and Linux unit tests
Bug: 134460638
Change-Id: Ieb84296eefd00478260ebc42d242f9bef2d8c8d1

libwvdrmengine/cdm/core/test/test_base.cpp

@@ -288,7 +288,7 @@ void WvCdmTestBase::Provision(size_t max_attempts) {
         binary_prov_request.begin(), binary_prov_request.end())));
   }
 
-  LOGV("WvCdmTestBase::Provision: req=%s", prov_request.c_str());
+  LOGV("Provisioning request: req = %s", prov_request.c_str());
 
   // Ignore URL provided by CdmEngine.  Use ours, as configured
   // for test vs. production server.