Retire obsolete DrMemory suppressions ..176270

These have recently been retired from Valgrind, and are also being retired from Dr Memory:

bug_164198
bug_170340
bug_172025
bug_173096
bug_175985
bug_176270

BUG=164198,170340,172025,173096,175985,176270
R=bruening@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/590943002

Cr-Commit-Position: refs/heads/master@{#296050}

tools/valgrind/drmemory/suppressions_full.txt

@@ -1365,73 +1365,6 @@ name=bug_162825
 ...
 *!gpu::gles2::GLES2DecoderImpl::InitializeShaderTranslator
 
-UNINITIALIZED READ
-name=bug_164198
-*!blink::RenderBox::paintFillLayers
-...
-*!blink::RenderBlock::paintObject
-*!blink::RenderBlock::paint
-*!blink::RenderLayer::paintLayerContents
-*!blink::RenderLayer::paintLayerContentsAndReflection
-*!blink::RenderLayer::paintLayer
-*!blink::RenderLayer::paintList
-*!blink::RenderLayer::paintLayerContents
-*!blink::RenderLayer::paintLayerContentsAndReflection
-*!blink::RenderLayer::paintLayer
-
-UNINITIALIZED READ
-name=bug_170340
-*!WTF::AtomicString::add
-*!WTF::AtomicString::AtomicString
-*!blink::HTMLPreloadScanner::processToken
-*!blink::HTMLPreloadScanner::scan
-*!blink::HTMLDocumentParser::pumpTokenizer
-*!blink::HTMLDocumentParser::pumpTokenizerIfPossible
-*!blink::HTMLDocumentParser::append
-*!blink::DecodedDataDocumentParser::flush
-*!blink::DocumentWriter::end
-*!blink::DocumentLoader::finishedLoading
-
-UNINITIALIZED READ
-name=bug_172025
-*!WebViewHost::didCreateDataSource
-*!blink::FrameLoaderClientImpl::createDocumentLoader
-*!blink::FrameLoader::init
-*!blink::Frame::init
-*!blink::WebFrameImpl::initializeAsMainFrame
-*!blink::WebViewImpl::initializeMainFrame
-*!TestShell::createNewWindow
-*!TestShell::createMainWindow
-*!TestShell::initialize
-
-UNINITIALIZED READ
-name=bug_173096
-*!bcmp
-*!cc::LayerTreeDebugState::equal
-*!cc::LayerTreeHost::setDebugState
-*!blink::WebLayerTreeViewImpl*_Zset*
-*!blink::WebViewImpl::setIsAcceleratedCompositingActive
-*!blink::WebViewImpl::setRootGraphicsLayer
-*!blink::ChromeClientImpl::attachRootGraphicsLayer
-*!blink::RenderLayerCompositor::attachRootLayer
-*!blink::RenderLayerCompositor::ensureRootLayer
-*!blink::RenderLayerCompositor::enableCompositingMode
-*!blink::RenderLayerCompositor::updateBacking
-*!blink::RenderLayerCompositor::updateLayerCompositingState
-*!blink::RenderLayer::styleChanged
-*!blink::RenderLayerModelObject::styleDidChange
-*!blink::RenderBox::styleDidChange
-
-UNINITIALIZED READ
-name=bug_175985
-*!cc::LayerTreeHost::setDebugState
-...
-*!blink::WebLayerTreeViewImpl*
-
-UNINITIALIZED READ
-name=bug_176270
-*!cc::LayerTreeDebugState::recordRenderingStats
-
 UNINITIALIZED READ
 name=bug_176616_a
 *!WebTestRunner::WebTestProxyBase::didCreateDataSource