Replace ProGuard 5.3.3 with Google internal version.

Bug:
Change-Id: Ic49612a51691df3ac746378de8d978c71da08607
diff --git a/.gitignore b/.gitignore
index 1529cd0..1f468a4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,7 +34,7 @@
 third_party/jdwp-tests
 third_party/photos/*
 !third_party/photos/*.sha1
-third_party/proguard/
+third_party/proguard/*
 !third_party/proguard/*.sha1
 third_party/proguardsettings.tar.gz
 third_party/proguardsettings/
diff --git a/build.gradle b/build.gradle
index f3f3dff..dfb4623 100644
--- a/build.gradle
+++ b/build.gradle
@@ -113,7 +113,6 @@
                 "android_jar/lib-v25.tar.gz",
                 "android_jar/lib-v26.tar.gz",
                 "proguard/proguard5.2.1.tar.gz",
-                "proguard/proguard5.3.3.tar.gz",
                 "gradle/gradle.tar.gz",
                 "jdwp-tests.tar.gz",
                 "jasmin.tar.gz",
@@ -167,6 +166,7 @@
         "youtube/youtube.android_12.17.tar.gz",
         "youtube/youtube.android_12.22.tar.gz",
         "proguardsettings.tar.gz",
+        "proguard/proguard_internal_159423826.tar.gz",
     ],
 ]
 
diff --git a/third_party/proguard/proguard5.3.3.tar.gz.sha1 b/third_party/proguard/proguard5.3.3.tar.gz.sha1
deleted file mode 100644
index 7a37d5c..0000000
--- a/third_party/proguard/proguard5.3.3.tar.gz.sha1
+++ /dev/null
@@ -1 +0,0 @@
-b197e2783baf8ade021d5feeaf609551735cd7b0
\ No newline at end of file
diff --git a/third_party/proguard/proguard_internal_159423826.tar.gz.sha1 b/third_party/proguard/proguard_internal_159423826.tar.gz.sha1
new file mode 100644
index 0000000..8fdbf19
--- /dev/null
+++ b/third_party/proguard/proguard_internal_159423826.tar.gz.sha1
@@ -0,0 +1 @@
+933e970c611a306ef5d755234820188bc50c4c60
\ No newline at end of file