Update from https://crrev.com/309415

third_party/android_platform/README.chromium

Index: third_party/android_platform/README.chromium
diff --git a/tools/android_stack_parser/README.chromium b/third_party/android_platform/README.chromium
similarity index 75%
copy from tools/android_stack_parser/README.chromium
copy to third_party/android_platform/README.chromium
index f72f45c43d7174de4b1f6166c4ce6ffee4ac6da2..c34702ff6cce5401dabc158118c47bc29861609a 100644
--- a/tools/android_stack_parser/README.chromium
+++ b/third_party/android_platform/README.chromium
@@ -12,8 +12,7 @@ Description:
 Android Platform engineering tools, specifically stack symbolization scripts
 and a jar containing the AOSP framework to compile the Android WebView
 glue layer against. The sources used to build the AOSP framework jar can be
-checked out using repo on the corresponding manifest file. The AOSP framework
-jar is built by invoking make on the android_system_stubs target.
+checked out using repo on the corresponding manifest file.
 
 Local Modifications:
 Only picked the few scripts needed by chrome.
@@ -23,6 +22,3 @@ Added support for parsing LOG(FATAL) and DCHECK errors and their
     stack traces, as emitted by src/base/debug/stack_trace_android.cc
 Added support for finding symbols when library is loaded directly from the APK.
 Changed the toolchain to remove references to 4.6 toolchains.
-Added support for arch=x64 as an alias to arch=x86_64
-Added support for mojo. Specifically detection of mojo apps downloaded
-    to temporary files which are in crash stacks.