Remove restriction on x64 chromium linker builds.

As of r287591 the android chromium linker supports EM_X86_64 and x86_64
relocations.  Remove the restriction preventing libchromium_android_linker.so
building when arch=x64.

BUG=369133

Review URL: https://codereview.chromium.org/470133003

Cr-Commit-Position: refs/heads/master@{#289683}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289683 0039d316-1c4b-4281-b951-d872f2087c98

base/base.gyp

@@ -1411,10 +1411,10 @@
           'target_name': 'chromium_android_linker',
           'type': 'shared_library',
           'conditions': [
-            ['android_webview_build == 0 and target_arch != "x64"', {
-              # Avoid breaking the webview build because it
-              # does not have <(android_ndk_root)/crazy_linker.gyp.
-              # Note that webview never uses the linker anyway.
+            # Avoid breaking the webview build because it
+            # does not have <(android_ndk_root)/crazy_linker.gyp.
+            # Note that webview never uses the linker anyway.
+            ['android_webview_build == 0', {
               'sources': [
                 'android/linker/linker_jni.cc',
               ],