devtools: bump max number of devtools isolated worlds

DevTools protocol method |Page.addScriptToEvaluateOnNewDocument| accepts
an optional "worldName" argument. When defined, a script will be
evaluated in a new isolated world.

These worlds are getting re-created on every page navigation. This patch
lifts the limit for inspector-created isolated worlds from 100 to
2^29.

R=pfeldman

Change-Id: Iec387ea0adb79bad759446dd76007bfb3cec38e3
Reviewed-on: https://chromium-review.googlesource.com/c/1496759
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636867}

third_party/blink/public/platform/web_isolated_world_ids.h

@@ -12,7 +12,7 @@ enum IsolatedWorldId {
   kEmbedderWorldIdLimit = (1 << 29),
   kDocumentXMLTreeViewerWorldId,
   kDevToolsFirstIsolatedWorldId,
-  kDevToolsLastIsolatedWorldId = kDevToolsFirstIsolatedWorldId + 100,
+  kDevToolsLastIsolatedWorldId = kDevToolsFirstIsolatedWorldId + (1 << 29),
   kIsolatedWorldIdLimit,
 };