Android WebView: re-enable linker warnings where possible.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 27de0576926fbd294120aa0a3150399f1db28749..61f11034675e8e6e0304be2dab8a3c9e9791a93e 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2816,14 +2816,6 @@
                   '-Wl,--warn-shared-textrel',
                 ],
               }],
-              ['OS=="android" and android_webview_build==1', {
-                'ldflags!': [
-                  # Must not turn on --fatal-warnings or warn-shared-textrel,
-                  # see crbug.com/157326.
-                  '-Wl,--fatal-warnings',
-                  '-Wl,--warn-shared-textrel',
-                ],
-              }],
               ['OS=="android" and android_full_debug==0', {
                 # Some configurations are copied from Release_Base to reduce
                 # the binary size.
@@ -2897,14 +2889,6 @@
                   '-Wl,--warn-shared-textrel',
                 ],
               }],
-              ['OS=="android" and android_webview_build==1', {
-                'ldflags!': [
-                  # Must not turn on --fatal-warnings or
-                  # shared-text-rel, see crbug.com/157326.
-                  '-Wl,--fatal-warnings',
-                  '-Wl,--warn-shared-textrel',
-                ],
-              }],
               ['clang==1', {
                 'cflags!': [
                   '-fno-ident',
@@ -3808,6 +3792,8 @@
               '-Wl,--gc-sections',
               '-Wl,-O1',
               '-Wl,--as-needed',
+              '-Wl,--warn-shared-textrel',
+              '-Wl,--fatal-warnings',
             ],
           }],
           # Settings for building host targets on mac.