base: Erase unused FOR_EACH_OBSERVER macro.

base/android/java/src/org/chromium/base/ObserverList.java

Index: base/android/java/src/org/chromium/base/ObserverList.java
diff --git a/base/android/java/src/org/chromium/base/ObserverList.java b/base/android/java/src/org/chromium/base/ObserverList.java
index 7a2ab984feb2351ff8c786eceead74e832d2cc18..9c53b5472a6bbc25ba66459a73ee908f308f4666 100644
--- a/base/android/java/src/org/chromium/base/ObserverList.java
+++ b/base/android/java/src/org/chromium/base/ObserverList.java
@@ -21,7 +21,7 @@ import javax.annotation.concurrent.NotThreadSafe;
  * The implementation (and the interface) is heavily influenced by the C++ ObserverList.
  * Notable differences:
  *   - The iterator implements NOTIFY_EXISTING_ONLY.
- *   - The FOR_EACH_OBSERVER closure is left to the clients to implement in terms of iterator().
+ *   - The range-based for loop is left to the clients to implement in terms of iterator().
  * <p/>
  * This class is not threadsafe. Observers MUST be added, removed and will be notified on the same
  * thread this is created.