UBSAN fixes.

tools/ubsan_vptr/blacklist.txt

-#############################################################################
-# UBSan vptr blacklist.
-# Function and type based blacklisting use a mangled name, and it is especially
-# tricky to represent C++ types. For now, any possible changes by name manglings
-# are simply represented as wildcard expressions of regexp, and thus it might be
-# over-blacklisted.
-
-#############################################################################
-# Identical layouts.
-# If base and derived classes have identifical memory layouts (i.e., the same
-# object size) and both have no virtual functions, we blacklist them as there
-# would be not much security implications.
-
-fun:*LifecycleNotifier*addObserver*
-fun:*LifecycleNotifier*removeObserver*
-fun:*toWebInputElement*
-type:*base*MessageLoopForIO*
-type:*BlockRefType*
-type:*SkAutoTUnref*
-type:*WDResult*
-type:*ExecutionContext*
-type:*WebInputElement*
-type:*WebFormControlElement*
-
-# Avoid identical layout cases for 86 different classes in InspectorTypeBuilder,
-# all of which are guarded using COMPILER_ASSERT on the object size. Two more
-# types are also blacklisted due to the template class (JSONArray <-> Array<T>).
-
-src:*InspectorTypeBuilder.h*
-type:*TypeBuilder*
-type:*JSONArray*
-
-#############################################################################
-# Base class's constructor accesses a derived class's member.
-
-fun:*DoublyLinkedListNode*
-type:*content*WebUIExtensionData*
-
-# RenderFrameObserverTracker<T>::RenderFrameObserverTracker()
-fun:*content*RenderFrameObserverTracker*RenderFrame*
-
-# RenderViewObserverTracker<T>::RenderViewObserverTracker()
-fun:*content*RenderViewObserverTracker*RenderView*
-
-#############################################################################
-# Base class's destructor accesses a derived class.
-
-fun:*DatabaseContext*contextDestroyed*
-
-#############################################################################
-# static_cast into itself in the constructor.
-
-fun:*RefCountedGarbageCollected*makeKeepAlive*
-fun:*ThreadSafeRefCountedGarbageCollected*makeKeepAlive*
-
-#############################################################################
-# Accessing data in destructurors where the class has virtual inheritances.
-
-type:*content*RenderWidgetHost*
-
-# Mangled name for content::RenderViewHostImpl::~RenderViewHostImpl()
-fun:*content*RenderViewHostImpl*
-
-#############################################################################
-# Using raw pointer values.
-#
-# A raw pointer value (16) is used to infer the field offset by
-# GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET.
-
-src:*/third_party/protobuf/src/google/protobuf/compiler/plugin.pb.cc
-src:*/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_message.cc
-src:*/third_party/protobuf/src/google/protobuf/descriptor.pb.cc
-
-#############################################################################
-# Avoid link errors.
-# Ubsan vptr needs typeinfo on the target class, but it looks like typeinfo is
-# not avaiable if the class is not exported.  For now, simply blacklisted to
-# avoid link errors; e.g., undefined reference to 'typeinfo for [CLASS_NAME]'.
-
-# obj/ppapi/libppapi_proxy.a(obj/ppapi/proxy/ppapi_proxy.proxy_channel.o):../../ppapi/proxy/proxy_channel.cc:__unnamed_53: error: undefined reference to 'typeinfo for IPC::TestSink'
-src:*/ppapi/proxy/proxy_channel.cc
-
-# obj/chrome/libbrowser.a(obj/chrome/browser/net/browser.predictor.o):../../chrome/browser/net/predictor.cc:__unnamed_577: error: undefined reference to 'typeinfo for ProxyAdvisor'
-src:*/chrome/browser/net/predictor.cc
-
-# obj/third_party/pdfium/libfpdfapi.a(obj/third_party/pdfium/core/src/fpdfapi/fpdf_render/fpdfapi.fpdf_render_text.o):../../third_party/pdfium/core/src/fpdfapi/fpdf_render/:__unnamed_360: error: undefined reference to 'typeinfo for CPDF_InlineImages'
-src:*/third_party/pdfium/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
-
-# obj/third_party/libwebm/libwebm.a(obj/third_party/libwebm/source/libwebm.mkvmuxer.o)(.data.rel..L__unnamed_2+0x18): error: undefined reference to 'typeinfo for mkvparser::IMkvReader'
-src:*/third_party/libwebm/source/mkvmuxer.cpp