Remove android_webview_build conditions from base.

Remove references to android_webview_build now that we no longer support
that build configuration. Fold all conditions into the general
OS==android sections.

BUG=440793

Review URL: https://codereview.chromium.org/1010653003

Cr-Commit-Position: refs/heads/master@{#322087}

base/android/linker/BUILD.gn

@@ -5,7 +5,6 @@
 import("//build/config/android/config.gni")
 
 assert(is_android)
-assert(!is_android_webview_build)
 
 # GYP: //base/base.gyp:chromium_android_linker
 shared_library("chromium_android_linker") {

base/base.gyp

@@ -103,6 +103,7 @@
             }],
           ],
           'dependencies': [
+            'base_java',
             'base_jni_headers',
             '../third_party/ashmem/ashmem.gyp:ashmem',
           ],
@@ -118,11 +119,6 @@
             '../build/android/cpufeatures.gypi',
           ],
         }],
-        ['OS == "android" and _toolset == "target" and android_webview_build == 0', {
-          'dependencies': [
-            'base_java',
-          ],
-        }],
         ['os_bsd==1', {
           'include_dirs': [
             '/usr/local/include',
@@ -1412,15 +1408,9 @@
             'base_java_library_process_type',
             'base_java_memory_pressure_level',
             'base_native_libraries_gen',
-          ],
-          'includes': [ '../build/java.gypi' ],
-          'conditions': [
-            ['android_webview_build==0', {
-              'dependencies': [
             '../third_party/jsr-305/jsr-305.gyp:jsr_305_javalib',
           ],
-            }]
-          ],
+          'includes': [ '../build/java.gypi' ],
         },
         {
           # GN: //base:base_java_unittest_support
@@ -1490,11 +1480,6 @@
           # GN: //base/android/linker:chromium_android_linker
           'target_name': 'chromium_android_linker',
           'type': 'shared_library',
-          'conditions': [
-            # 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',
           ],
@@ -1508,8 +1493,6 @@
             # However, we use our own fork.  See bug 384700.
             '../third_party/android_crazy_linker/crazy_linker.gyp:crazy_linker',
           ],
-            }],
-          ],
         },
         {
           # TODO(GN)

base/base.gypi

@@ -836,13 +836,6 @@
               ['include', '^threading/platform_thread_linux\\.cc$'],
             ],
           }],
-          ['OS == "android" and <(android_webview_build)==1', {
-            'defines': [
-               # WebView builds as part of the system which already has sincos;
-               # avoid defining it again as it causes a linker warning.
-               'ANDROID_SINCOS_PROVIDED',
-            ],
-          }],
           ['<(chromeos) == 1', {
             'sources!': [
               'power_monitor/power_monitor_device_source_posix.cc',