https://bugs.webkit.org/show_bug.cgi?id=93128

Reviewed by Anders Carlsson.

BString automatically calls SysFreeString() in its destructor which helps
avoiding memory leaks. So it should be used instead of BSTR directly.
Add operator& to BString to allow its usage for out parameters too (like COMPtr).
This fixes already a few memory leaks in the existing code.

Source/WebCore:

* platform/win/BString.cpp:
(WebCore::BString::~BString):
(WebCore::BString::adoptBSTR):
(WebCore::BString::clear):
(WebCore):
* platform/win/BString.h:
(BString):
(WebCore::BString::operator&):

Source/WebKit/win:

* DefaultPolicyDelegate.cpp:
(DefaultPolicyDelegate::decidePolicyForNavigationAction):
(DefaultPolicyDelegate::decidePolicyForMIMEType):
(DefaultPolicyDelegate::unableToImplementPolicyWithError):
* MarshallingHelpers.cpp:
(MarshallingHelpers::KURLToBSTR):
(MarshallingHelpers::CFStringRefToBSTR):
(MarshallingHelpers::stringArrayToSafeArray):
(MarshallingHelpers::safeArrayToStringArray):
* WebCoreSupport/WebChromeClient.cpp:
(WebChromeClient::runJavaScriptPrompt):
* WebCoreSupport/WebEditorClient.cpp:
(WebEditorClient::checkGrammarOfString):
(WebEditorClient::getGuessesForWord):
* WebFrame.cpp:
(WebFrame::canProvideDocumentSource):
* WebHistory.cpp:
(WebHistory::removeItem):
(WebHistory::addItem):
* WebIconDatabase.cpp:
(WebIconDatabase::startUpIconDatabase):
* WebNotificationCenter.cpp:
(WebNotificationCenter::postNotification):
* WebPreferences.cpp:
(WebPreferences::setStringValue):
* WebView.cpp:
(toAtomicString):
(toString):
(toKURL):
(PreferencesChangedOrRemovedObserver::onNotify):
(WebView::close):
(WebView::canShowMIMEType):
(WebView::initWithFrame):
(WebView::setApplicationNameForUserAgent):
(WebView::setCustomUserAgent):
(WebView::userAgentForURL):
(WebView::setCustomTextEncodingName):
(WebView::customTextEncodingName):
(WebView::setPreferences):
(WebView::searchFor):
(WebView::executeCoreCommandByName):
(WebView::markAllMatchesForText):
(WebView::setGroupName):
(WebView::registerURLSchemeAsLocal):
(WebView::replaceSelectionWithText):
(WebView::onNotify):
(WebView::notifyPreferencesChanged):
(WebView::MIMETypeForExtension):
(WebView::standardUserAgentWithApplicationName):
(WebView::addAdditionalPluginDirectory):
(WebView::registerEmbeddedViewMIMEType):
(WebView::addOriginAccessWhitelistEntry):
(WebView::removeOriginAccessWhitelistEntry):
(WebView::geolocationDidFailWithError):
(WebView::setDomainRelaxationForbiddenForURLScheme):
(WebView::setCompositionForTesting):
(WebView::confirmCompositionForTesting):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@128988 268f45cc-cd09-0410-ab3c-d52691b4dbfc