android: Turn on fission and symbol_level=2 by default.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index d6392d1df7b2618bd3a7ba5a86129f039aa9babb..efbf047f616888a1502f5bb4d87d5f4202b07a5b 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -6,7 +6,6 @@ import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
-import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
 import("//build_overrides/build.gni")
 
@@ -125,11 +124,6 @@ if (gold_path == false) {
   }
 }
 
-if (use_debug_fission == "default") {
-  use_debug_fission =
-      is_debug && !is_android && !is_win && use_gold && cc_wrapper == ""
-}
-
 # default_include_dirs ---------------------------------------------------------
 #
 # This is a separate config so that third_party code (which would not use the
@@ -1724,14 +1718,6 @@ config("symbols") {
         # dump_syms, so this is still required (https://crbug.com/622406).
         cflags += [ "-fno-standalone-debug" ]
       }
-    } else if (is_android) {
-      # Breakpad can't handle DWARF 4 symbols properly yet, so use DWARF 3
-      # explicitly on android where we are hitting https://crbug.com/638485.
-      # The arguments MUST be in this order because of a gcc arg parsing bug.
-      cflags = [
-        "-gdwarf-3",
-        "-g2",
-      ]
     } else {
       cflags = [ "-g2" ]
     }
@@ -1765,17 +1751,7 @@ config("minimal_symbols") {
     cflags = []
     ldflags = [ "/DEBUG" ]
   } else {
-    if (is_android) {
-      # Breakpad can't handle DWARF 4 symbols properly yet, so use DWARF 3
-      # explicitly on android where we are hitting https://crbug.com/638485.
-      # The arguments MUST be in this order because of a gcc arg parsing bug.
-      cflags = [
-        "-gdwarf-3",
-        "-g1",
-      ]
-    } else {
-      cflags = [ "-g1" ]
-    }
+    cflags = [ "-g1" ]
 
     # Note: -gsplit-dwarf implicitly turns on -g2 with clang, so don't pass it.
     asmflags = cflags