Fix various errorprone warnings and errors.

base/android/javatests/src/org/chromium/base/ObserverListTest.java

Index: base/android/javatests/src/org/chromium/base/ObserverListTest.java
diff --git a/base/android/javatests/src/org/chromium/base/ObserverListTest.java b/base/android/javatests/src/org/chromium/base/ObserverListTest.java
index 973682b9328c0ff534bb58146387e395a4580311..347c842f2a9c6433a260e5496611818df0674bc7 100644
--- a/base/android/javatests/src/org/chromium/base/ObserverListTest.java
+++ b/base/android/javatests/src/org/chromium/base/ObserverListTest.java
@@ -70,6 +70,7 @@ public class ObserverListTest extends InstrumentationTestCase {
         }
     }
 
+    @SuppressWarnings("ElementsCountedInLoop")

[nyquist, 2015/08/19 09:51:33]

Optional nit: I guess you could technically add an early return here along the
lines of:
if (iterable instanceof Collection) return (Collection<?> iterable).size();

[mikecase (-- gone --), 2015/08/19 23:15:07]

Done

     private static <T> int getSizeOfIterable(Iterable<T> iterable) {
         int num = 0;
         for (T el : iterable) num++;