Remove use of WebCrypto digestSynchronous in Blink.

Source/core/frame/csp/ContentSecurityPolicy.cpp

Index: Source/core/frame/csp/ContentSecurityPolicy.cpp
diff --git a/Source/core/frame/csp/ContentSecurityPolicy.cpp b/Source/core/frame/csp/ContentSecurityPolicy.cpp
index bc22f66ea0f90e3aa23f770c781f6790e712a783..82723182bbc4e7384b7a4835c1d0907c2b68c5ec 100644
--- a/Source/core/frame/csp/ContentSecurityPolicy.cpp
+++ b/Source/core/frame/csp/ContentSecurityPolicy.cpp
@@ -327,8 +327,8 @@ bool checkDigest(const String& source, uint8_t hashAlgorithmsUsed, const CSPDire
     for (size_t i = 0; i < (sizeof(kAlgorithmMap) / sizeof(kAlgorithmMap[0])); i++) {
         DigestValue digest;
         if (kAlgorithmMap[i].cspHashAlgorithm & hashAlgorithmsUsed) {
-            computeDigest(kAlgorithmMap[i].algorithm, normalizedSource.data(), normalizedSource.length(), digest);
-            if (isAllowedByAllWithHash<allowed>(policies, CSPHashValue(kAlgorithmMap[i].cspHashAlgorithm, digest)))
+            bool digestSuccess = computeDigest(kAlgorithmMap[i].algorithm, normalizedSource.data(), normalizedSource.length(), digest);
+            if (digestSuccess && isAllowedByAllWithHash<allowed>(policies, CSPHashValue(kAlgorithmMap[i].cspHashAlgorithm, digest)))
                 return true;
         }
     }