cronet: disable code shrinking for library build (#6448) (#6452)

cronet/build.gradle

diff --git a/cronet/build.gradle b/cronet/build.gradle
index 87b4eef..e88f361 100644
--- a/cronet/build.gradle
+++ b/cronet/build.gradle
@@ -42,8 +42,8 @@
     buildTypes {
         debug { minifyEnabled false }
         release {
-            minifyEnabled true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            minifyEnabled false
+            consumerProguardFiles 'proguard-rules.pro'
         }
     }
     testOptions { unitTests { includeAndroidResources = true } }