[Cronet] Use Context's ClassLoader to load Cronet

components/cronet/android/api/src/org/chromium/net/CronetEngine.java

Index: components/cronet/android/api/src/org/chromium/net/CronetEngine.java
diff --git a/components/cronet/android/api/src/org/chromium/net/CronetEngine.java b/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
index f024732d3c13f5c2fa25ef09a7aa2c125a5b7b77..23c5312d68cdfd9ad044c0548bb111c92ce3368d 100644
--- a/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
+++ b/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
@@ -1010,7 +1010,8 @@ public abstract class CronetEngine {
         CronetEngine cronetEngine = null;
         try {
             Class<? extends CronetEngine> engineClass =
-                    CronetEngine.class.getClassLoader()
+                    builder.getContext()

[kapishnikov, 2016/06/02 16:17:47]

Is it the same context that is supplied in the constructor of the Builder class?
We should expect that the user is going to construct the Builder with the app
context or the activity context.

[pauljensen, 2016/06/03 13:24:30]

Yes
As the API stands now, yes.  However I'm proposing having another method to
construct the CronetEngine.Builder, and potentially hiding the default
CronetEngine.Builder().

+                            .getClassLoader()
                             .loadClass(CRONET_URL_REQUEST_CONTEXT)
                             .asSubclass(CronetEngine.class);
             Constructor<? extends CronetEngine> constructor =