Fix suppression for WindowProxy::initializeIfNeeded to match on release builds.

Due to 484760, symbolization for WindowProxy::initializeIfNeeded is
different between debug and release builds, which causes the current
suppression to not match on the try bots.  On release builds, it comes
up as: > #8 0x7875c74 in initializeIfNeeded
third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp:209:19

Use blink::WindowProxy::createContext instead.

BUG=484760, 478792
NOTRY=true

Review URL: https://codereview.chromium.org/1130603002

Cr-Original-Commit-Position: refs/heads/master@{#328447}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 8c214f63c675d641c31053ebd1c56688e774f557

sanitizers/lsan_suppressions.cc

@@ -59,7 +59,6 @@ char kLSanDefaultSuppressions[] =
 "leak:WTF::StringImpl::createUninitialized\n"
 "leak:WTF::StringImpl::create8BitIfPossible\n"
 "leak:blink::MouseEvent::create\n"
-"leak:blink::WindowProxy::initializeIfNeeded\n"
 "leak:blink::*::*GetterCallback\n"
 "leak:blink::CSSComputedStyleDeclaration::create\n"
 "leak:blink::V8PerIsolateData::ensureDomInJSContext\n"
@@ -69,6 +68,9 @@ char kLSanDefaultSuppressions[] =
 // This should really be RemoteDOMWindow::create, but symbolization is
 // weird in release builds. https://crbug.com/484760
 "leak:blink::RemoteFrame::create\n"
+// Likewise, this should really be blink::WindowProxy::initializeIfNeeded.
+// https://crbug.com/484760
+"leak:blink::WindowProxy::createContext\n"
 
 // http://crbug.com/356785
 "leak:content::RenderViewImplTest_DecideNavigationPolicyForWebUI_Test::TestBody\n"