[webcrypto] Change HMAC key generation length from bytes to bits.

public/platform/WebCryptoAlgorithmParams.h

Index: public/platform/WebCryptoAlgorithmParams.h
diff --git a/public/platform/WebCryptoAlgorithmParams.h b/public/platform/WebCryptoAlgorithmParams.h
index f6fe2ee0b7bf369d2f16d562052bf0e4f0604277..5d94d350e55c728e8b5a820843ee1b84604d0c2f 100644
--- a/public/platform/WebCryptoAlgorithmParams.h
+++ b/public/platform/WebCryptoAlgorithmParams.h
@@ -131,23 +131,23 @@ public:
 
 class WebCryptoHmacKeyGenParams : public WebCryptoAlgorithmParamsWithHash {
 public:
-    WebCryptoHmacKeyGenParams(const WebCryptoAlgorithm& hash, bool hasLengthBytes, unsigned lengthBytes)
+    WebCryptoHmacKeyGenParams(const WebCryptoAlgorithm& hash, bool hasLengthBits, unsigned lengthBits)
         : WebCryptoAlgorithmParamsWithHash(hash)
-        , m_hasLengthBytes(hasLengthBytes)
-        , m_optionalLengthBytes(lengthBytes)
+        , m_hasLengthBits(hasLengthBits)
+        , m_optionalLengthBits(lengthBits)
     {
-        BLINK_ASSERT(hasLengthBytes || !lengthBytes);
+        BLINK_ASSERT(hasLengthBits || !lengthBits);
     }
 
     virtual WebCryptoAlgorithmParamsType type() const { return WebCryptoAlgorithmParamsTypeHmacKeyGenParams; }
 
-    bool hasLengthBytes() const { return m_hasLengthBytes; }
+    bool hasLengthBits() const { return m_hasLengthBits; }
 
-    unsigned optionalLengthBytes() const { return m_optionalLengthBytes; }
+    unsigned optionalLengthBits() const { return m_optionalLengthBits; }
 
 private:
-    const bool m_hasLengthBytes;
-    const unsigned m_optionalLengthBytes;
+    const bool m_hasLengthBits;
+    const unsigned m_optionalLengthBits;
 };
 
 class WebCryptoRsaKeyGenParams : public WebCryptoAlgorithmParams {