Currently //ios/web_view requires to put all resource files (e.g., icudtl.dat) directly under the root bundle. But it makes the root bundle messy. We should allow putting them in a sub bundle e.g., ChromeIOSWebView.bundle.

We should either:

1. Hard-code to read resource files from a bundle named ChromeIOSWebView.bundle, and also put resource files in ChromeIOSWebView.bundle in ios_web_view_shell.

2. Add an API to specify the location of the resource files.

3. Use a dynamic framework instead of a static library, and put resource files in the bundle of the dynamic framework.