fix: misc-use-internal-linkage warnings (#44843)

* refactor: misc-use-internal-linkage warnings in context bridge

move impl functions into anonymous namespace so that they're not visible
to other compilation units:

- ExposeAPIInWorld()
- IsCalledFromMainWorld()
- OverrideGlobalPropertyFromIsolatedWorld()
- OverrideGlobalValueFromIsolatedWorld()
- TraceKeyPath()

* refactor: misc-use-internal-linkage warnings in skia util

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- struct ScaleFactorPair
- kScaleFactorPairs[]
- GetScaleFactorFromPath()
- AddImageSkiaRepFromPath()

* refactor: misc-use-internal-linkage warnings in printing util

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- GetFullPagePlugin()

* refactor: misc-use-internal-linkage warnings in blijnk converter

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- GetKeyLocationCode()
- ModifiersToArray()

* refactor: misc-use-internal-linkage warnings in extrension system

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- ParseManifest()

* refactor: misc-use-internal-linkage warnings in skia util

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- GetFrameTokenMap()
- GetFrameTreeNodeIdMap()

* refactor: misc-use-internal-linkage warnings in electron_api_utility_process.cc

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- GetAllUtilityProcessWrappers()

* refactor: misc-use-internal-linkage warnings in electron_api_menu

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- InvokeBoolMethod()

* refactor: misc-use-internal-linkage warnings in platform util

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- struct TrashItemResult
- TrashItemOnBlockingThread()

shell/common/platform_util.cc

@@ -13,6 +13,8 @@
 
 namespace platform_util {
 
+namespace {
+
 struct TrashItemResult {
   bool success;
   std::string error;
@@ -24,6 +26,8 @@ TrashItemResult TrashItemOnBlockingThread(const base::FilePath& full_path) {
   return {success, error};
 }
 
+}  // namespace
+
 void TrashItem(const base::FilePath& full_path,
                base::OnceCallback<void(bool, const std::string&)> callback) {
   // XXX: is continue_on_shutdown right?