Clean up JSC shell entitlements to fix RAMificaton.

rdar://122826926

Reviewed by Yusuke Suzuki.

In https://commits.webkit.org/272448.472@safari-7618-branch, we switched
to the new allow-jit entitlement. This broke RAMiciation runs because
the JSC binary doesn't have the com.apple.developer.web-browser-engine.webcontent
entitlement. This patch adds it.

* Source/JavaScriptCore/Scripts/process-entitlements.sh:

Canonical link: https://commits.webkit.org/272448.538@safari-7618-branch

Source/JavaScriptCore/Scripts/process-entitlements.sh

@@ -102,6 +102,7 @@ function ios_family_process_jsc_entitlements()
         if [[ "${PLATFORM_NAME}" == iphoneos ]]; then
             if (( $(( ${SDK_VERSION_ACTUAL} )) >= 170400 )); then
                 plistbuddy Add :com.apple.developer.cs.allow-jit bool YES
+                plistbuddy Add :com.apple.developer.web-browser-engine.webcontent bool YES
             else
                 plistbuddy Add :dynamic-codesigning bool YES
             fi