Replace 'static::' with 'self::' when accessing private const.

This will prevent 'Undefined class constant' error if a plugin will be
added for one of these classes.

Author: vovayatsyuk

app/code/Magento/Backend/Model/Dashboard/Period.php

@@ -46,11 +46,11 @@ public function getDatePeriods(): array
     public function getPeriodChartUnits(): array
     {
         return [
-            static::PERIOD_24_HOURS => static::PERIOD_UNIT_HOUR,
-            static::PERIOD_7_DAYS => static::PERIOD_UNIT_DAY,
-            static::PERIOD_1_MONTH => static::PERIOD_UNIT_DAY,
-            static::PERIOD_1_YEAR => static::PERIOD_UNIT_MONTH,
-            static::PERIOD_2_YEARS => static::PERIOD_UNIT_MONTH
+            static::PERIOD_24_HOURS => self::PERIOD_UNIT_HOUR,
+            static::PERIOD_7_DAYS => self::PERIOD_UNIT_DAY,
+            static::PERIOD_1_MONTH => self::PERIOD_UNIT_DAY,
+            static::PERIOD_1_YEAR => self::PERIOD_UNIT_MONTH,
+            static::PERIOD_2_YEARS => self::PERIOD_UNIT_MONTH
         ];
     }
 }

app/code/Magento/Backend/ViewModel/ChartDisabled.php

@@ -57,7 +57,7 @@ public function __construct(
     public function getConfigUrl(): string
     {
         return $this->urlBuilder->getUrl(
-            static::ROUTE_SYSTEM_CONFIG,
+            self::ROUTE_SYSTEM_CONFIG,
             ['section' => 'admin', '_fragment' => 'admin_dashboard-link']
         );
     }
@@ -70,7 +70,7 @@ public function getConfigUrl(): string
     public function isChartEnabled(): bool
     {
         return $this->scopeConfig->isSetFlag(
-            static::XML_PATH_ENABLE_CHARTS,
+            self::XML_PATH_ENABLE_CHARTS,
             ScopeInterface::SCOPE_STORE
         );
     }

app/code/Magento/Catalog/Model/Config/LayerCategoryConfig.php

@@ -60,7 +60,7 @@ public function isCategoryFilterVisibleInLayerNavigation(
         }
 
         return $this->scopeConfig->isSetFlag(
-            static::XML_PATH_CATALOG_LAYERED_NAVIGATION_DISPLAY_CATEGORY,
+            self::XML_PATH_CATALOG_LAYERED_NAVIGATION_DISPLAY_CATEGORY,
             $scopeType,
             $scopeCode
         );

app/code/Magento/DownloadableImportExport/Model/Import/Product/Type/Downloadable.php

@@ -370,12 +370,12 @@ protected function isRowValidSample(array $rowData)
 
         foreach ($sampleData as $link) {
             if ($this->hasDomainNotInWhitelist($link, 'link_type', 'link_url')) {
-                $this->_entityModel->addRowError(static::ERROR_LINK_URL_NOT_IN_DOMAIN_WHITELIST, $this->rowNum);
+                $this->_entityModel->addRowError(self::ERROR_LINK_URL_NOT_IN_DOMAIN_WHITELIST, $this->rowNum);
                 $result = true;
             }
 
             if ($this->hasDomainNotInWhitelist($link, 'sample_type', 'sample_url')) {
-                $this->_entityModel->addRowError(static::ERROR_SAMPLE_URL_NOT_IN_DOMAIN_WHITELIST, $this->rowNum);
+                $this->_entityModel->addRowError(self::ERROR_SAMPLE_URL_NOT_IN_DOMAIN_WHITELIST, $this->rowNum);
                 $result = true;
             }
         }
@@ -406,12 +406,12 @@ protected function isRowValidLink(array $rowData)
 
         foreach ($linkData as $link) {
             if ($this->hasDomainNotInWhitelist($link, 'link_type', 'link_url')) {
-                $this->_entityModel->addRowError(static::ERROR_LINK_URL_NOT_IN_DOMAIN_WHITELIST, $this->rowNum);
+                $this->_entityModel->addRowError(self::ERROR_LINK_URL_NOT_IN_DOMAIN_WHITELIST, $this->rowNum);
                 $result = true;
             }
 
             if ($this->hasDomainNotInWhitelist($link, 'sample_type', 'sample_url')) {
-                $this->_entityModel->addRowError(static::ERROR_SAMPLE_URL_NOT_IN_DOMAIN_WHITELIST, $this->rowNum);
+                $this->_entityModel->addRowError(self::ERROR_SAMPLE_URL_NOT_IN_DOMAIN_WHITELIST, $this->rowNum);
                 $result = true;
             }
         }