Fix eclipse project dependencies.

- Use the prebuilts from the maven repo
- Make each project exports its dependencies to avoid having to
  redefine them in all projects.

Change-Id: Ib4c8fc192da224ff6fc765725cb106c865eebb97

• chimpchat/.classpath[diff]
• ddms/app/.classpath[diff]
• ddms/ddmuilib/.classpath[diff]
• hierarchyviewer2/app/.classpath[diff]
• hierarchyviewer2/hierarchyviewer2lib/.classpath[diff]
• sdkmanager/app/.classpath[diff]
• sdkmanager/sdkuilib/.classpath[diff]
• sdkmanager/sdkuilib/build.gradle[diff]
• swtmenubar/.classpath[diff]
• swtmenubar/src/main/java/com/android/menubar/MenuBarEnhancer.java[diff]
• swtmenubar/src/main/java/com/android/menubar/MenuBarEnhancer37.java[diff]
• uiautomatorviewer/.classpath[diff]