DrMemory: Remove a suppression of uninitialized error

tools/valgrind/drmemory/suppressions_full.txt

 # This file contains suppressions for the Dr.Memory tool, see
 # http://dev.chromium.org/developers/how-tos/using-drmemory
 #
 # This file should contain suppressions only for the reports happening
 # in the 'full' mode (drmemory_full).
 # For the reports that can happen in the light mode (a.k.a. drmemory_light),
 # please use suppressions.txt instead.
 
 ###############################################################
 # Known reports on the third party we have no control over.
@@ skipping 1642 matching lines @@
 *!ui::NativeThemeWin::PaintDirect
 
 UNINITIALIZED READ
 name=bug_377728
 ...
 *!Hunspell::suggest
 *!HunspellEngine::FillSuggestionList
 *!SpellcheckLanguage::SpellCheckWord
 *!SpellCheck::SpellCheckWord
 
-UNINITIALIZED READ
-name=bug_387373
-*!blink::WebEmbeddedWorkerImpl::startWorkerContext
-*!content::EmbeddedWorkerDispatcher::OnStartWorker
-*!EmbeddedWorkerMsg_StartWorker::Dispatch<>
-
 UNADDRESSABLE ACCESS
 name=bug_389132
 content.dll!crypto_kernel_do_load_cipher_type
 content.dll!crypto_kernel_load_cipher_type
 content.dll!crypto_kernel_init
 content.dll!cricket::SrtpSession::SetKey
 content.dll!cricket::SrtpSession::SetSend
 content.dll!cricket::SrtpFilter::SetRtpParams
 content.dll!cricket::BaseChannel::SetupDtlsSrtp
 content.dll!cricket::BaseChannel::ChannelWritable_w
@@ skipping 465 matching lines @@
 content.dll!content::ChildThreadImpl::Init
 content.dll!content::ChildThreadImpl::ChildThreadImpl
 content.dll!content::UtilityThreadImpl::UtilityThreadImpl
 content.dll!content::UtilityMain
 
 UNADDRESSABLE ACCESS
 name=bug_617740
 media.dll!mkvmuxer::Segment::WriteFramesAll
 media.dll!mkvmuxer::Segment::Finalize
 media.dll!media::WebmMuxer::~WebmMuxer