eclipse-java-google-style.xml and intellij-java-google-style.xml are obsolete and should be removed

Both [eclipse-java-google-style.xml](https://github.com/google/styleguide/blob/gh-pages/eclipse-java-google-style.xml) and [intellij-java-google-style.xml](https://github.com/google/styleguide/blob/gh-pages/intellij-java-google-style.xml) were last updated 4 years ago and are effectively obsolete. Google has moved its focus to [google-java-format](https://github.com/google/google-java-format) because “Eclipse and IntelliJ IDEA weren’t flexible enough to meet all the requirements of the [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html),” as described in google/google-java-format#695. The existence of these two files is misleading (e.g., the Language Support for Java extension for VS Code [still refers to eclipse-java-google-style.xml](https://github.com/redhat-developer/vscode-java/wiki/Formatter-settings)), and thus they should be removed.

@jbduncan