fix(v8): concatenate adjacent strings in V8 DEPS files

These follow Python string concatenation rules.

Author: joyeecheung

lib/update-v8/deps.js

@@ -31,7 +31,10 @@ async function readDeps(nodeDir) {
   const depsStr = await fs.readFile(path.join(nodeDir, 'deps/v8/DEPS'), 'utf8');
   const start = depsStr.indexOf('deps = {');
   const end = depsStr.indexOf('\n}', start) + 2;
-  const depsDeclaration = depsStr.substring(start, end).replace(/^ *#.*/gm, '');
+  const depsDeclaration = depsStr.substring(start, end)
+    .replace(/^ *#.*/gm, '')
+    // Join adjacent string literals
+    .replace(/'\s*\n\s*'/g, '');
   const Var = () => chromiumGit; // eslint-disable-line no-unused-vars
   let deps;
   eval(depsDeclaration); // eslint-disable-line no-eval