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WebKit: convert UChar to char16_t
https://bugs.webkit.org/show_bug.cgi?id=294733
rdar://153823213

Reviewed by Alex Christensen.

WebKit would like to switch from UChar to the C++ standard char16_t. This PR
makes the change for the Source/WebKit and Source/WebKitLegacy directories.
This is a simple textual substitution of \bUChar\b to char16_t. As these types
are currently typedefed to be identical, no functional changes are expected.

One file was excluded from this:
Source/WebKitLegacy/ios/Misc/WebUIKitSupport.h
because this file is included in plain [objective-C] code as well as C++ code,
where char16_t does not exist (it's a C++ type).

* Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:
(WebKit::NetworkLoadChecker::checkTAO):
* Source/WebKit/NetworkProcess/soup/WebSocketTaskSoup.cpp:
(WebKit::WebSocketTask::WebSocketTask):
* Source/WebKit/NetworkProcess/storage/CacheStorageRecord.cpp:
(WebKit::CacheStorageRecordInformation::updateVaryHeaders):
* Source/WebKit/Platform/IPC/ArgumentCoders.cpp:
(IPC::ArgumentCoder<String>::decode):
* Source/WebKit/Platform/IPC/DaemonCoders.h:
(WebKit::Daemon::Coder<WTF::String>::decode):
* Source/WebKit/Shared/API/c/WKString.cpp:
(WKStringGetCharacters):
* Source/WebKit/Shared/Extensions/WebExtensionLocalization.cpp:
(WebKit::WebExtensionLocalization::stringByReplacingPositionalPlaceholdersInString):
* Source/WebKit/Shared/Extensions/WebExtensionUtilities.cpp:
(WebKit::toErrorString):
* Source/WebKit/Shared/win/WebEventFactory.cpp:
(WebKit::textFromEvent):
(WebKit::unmodifiedTextFromEvent):
* Source/WebKit/UIProcess/API/APIContentRuleListStore.cpp:
(API::compiledToFile):
(API::getContentRuleListSourceFromMappedFile):
* Source/WebKit/UIProcess/API/gtk/DropTargetGtk3.cpp:
(WebKit::DropTarget::dataReceived):
* Source/WebKit/UIProcess/API/gtk/DropTargetGtk4.cpp:
(WebKit::DropTarget::accept):
* Source/WebKit/UIProcess/mac/LegacySessionStateCoding.cpp:
(WebKit::HistoryEntryDataEncoder::operator<<):
(WebKit::HistoryEntryDataDecoder::operator>>):
* Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.mm:
(WebKit::UnifiedPDFPlugin::revealFragmentIfNeeded):
* Source/WebKit/WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::shouldSkipDecidePolicyForResponse const):
* Source/WebKit/webpushd/PushClientConnection.mm:
(WebPushD::isValidPushPartition):
* Source/WebKitLegacy/ios/Misc/WebUIKitSupport.mm:
(WebKitGetLastLineBreakInBuffer):
* Source/WebKitLegacy/mac/Misc/WebKitNSStringExtras.mm:
(-[NSString _web_drawAtPoint:font:textColor:]):
(-[NSString _web_widthWithFont:]):
* Source/WebKitLegacy/mac/WebCoreSupport/WebVisitedLinkStore.mm:
(WebVisitedLinkStore::addVisitedLink):
* Source/WebKitLegacy/mac/WebView/WebFrame.mm:
(-[WebFrame _smartInsertForString:replacingRange:beforeString:afterString:]):

Canonical link: https://commits.webkit.org/296864@main

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